ayandon.com.tr - Ayandon | Haber Fırtınası

Quick Summary

Online Status

Online

Server IP address resolved: Yes
Http response code: 200
Response time: 2.61 sec.
Last Checked: 12/14/2024

Ayandon.com.tr receives about 1,701 unique visitors and 3,402 pageviews per day. The estimated value of ayandon.com.tr is 2,640 USD. Each unique visitor makes about 2 pageviews on average.

Ayandon.com.tr is registered under .TR top-level domain. Check other websites in .TR zone.

At the time of the last check (December 14, 2024) ayandon.com.tr has an expired SSL certificate issued by Google Trust Services (expired on February 19, 2025). Check other websites using SSL certificates issued by Google Trust Services.

According to Symantec ayandon.com.tr is quite a safe domain.

Ayandon.com.tr General Information

Not tested yet

Ayandon.com.tr Alexa Rank History

Alexa Rank shows how popular ayandon.com.tr is in comparison with other sites. The most popular site has Alexa Rank equals 1. If ayandon.com.tr has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to ayandon.com.tr and pageviews on ayandon.com.tr over the past 3 months.

Ayandon.com.tr Safety Information

Overview

Last Updated: 04/04/2025

Unknown status.
We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 12/14/2024

ayandon.com.tr is safe.

Norton ConnectSafe evaluates ayandon.com.tr for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 04/04/2025

Not yet checked.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 04/04/2025

Site Advisor

Last Updated: 04/04/2025

Not yet checked.

McAfee assesses ayandon.com.tr for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze ayandon.com.tr for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 04/04/2025

ayandon.com.tr child safety isunknown.

The WOT calculates reputation of the ayandon.com.tr. This reputation system receives ratings from users and information from third-party sources, assesses the ayandon.com.tr for safety features and confirms, whether ayandon.com.tr is suitable for children.

SSL Information

SSL Checker Tool

Domain	ayandon.com.tr
Issuer Organization	Google Trust Services
Issuer	WE1
Algorithm	ecdsa-with-SHA256
Valid form	11/21/2024
Expiration	02/19/2025
Signed	Certificate is not self signed
Additional Domains	ayandon.com.tr *.ayandon.com.tr

Ayandon.com.tr Server Information

Server Location

Geolocation Tool

Phoenix

Arizona

United States

ASN Information

ASN Lookup Tool

ASN ID: 13335
ASN Title: CLOUDFLARENET - Cloudflare, Inc., US

Last Update: 12/14/2024

ASN Whois

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 13335
ASName: CLOUDFLARENET
ASHandle: AS13335
RegDate: 2010-07-14
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/autnum/13335

OrgName: Cloudflare, Inc.
OrgId: CLOUD14
Address: 101 Townsend Street
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2010-07-09
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/entity/CLOUD14

OrgTechHandle: ADMIN2521-ARIN
OrgTechName: Admin
OrgTechPhone: +1-650-319-8930
OrgTechEmail: rir@cloudflare.com
OrgTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

OrgAbuseHandle: ABUSE2916-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-319-8930
OrgAbuseEmail: abuse@cloudflare.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

OrgNOCHandle: NOC11962-ARIN
OrgNOCName: NOC
OrgNOCPhone: +1-650-319-8930
OrgNOCEmail: noc@cloudflare.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RNOCHandle: NOC11962-ARIN
RNOCName: NOC
RNOCPhone: +1-650-319-8930
RNOCEmail: noc@cloudflare.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RTechHandle: ADMIN2521-ARIN
RTechName: Admin
RTechPhone: +1-650-319-8930
RTechEmail: rir@cloudflare.com
RTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

RAbuseHandle: ABUSE2916-ARIN
RAbuseName: Abuse
RAbusePhone: +1-650-319-8930
RAbuseEmail: abuse@cloudflare.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Ayandon.com.tr Domain Name Information

WHOIS

WHOIS Lookup Tool

Domain Whois

** Domain Name: ayandon.com.tr
Domain Status: Active
Frozen Status: -
Transfer Status: The domain is LOCKED to transfer.

** Registrant:

Hidden upon user request
Hidden upon user request
Hidden upon user request

** Registrar:
NIC Handle : fp39
Organization Name : İsimtescil Bilişim Anonim Şirketi
Address : Tantavi Mah. Menteşoğlu Cad.
No: 25 Kat: 2 Terra Plaza Ümraniye
- İstanbul Türkiye
Phone : 90-850-2000444
Fax : 90-216-6062989

** Domain Servers:
benedict.ns.cloudflare.com
marlowe.ns.cloudflare.com

** Additional Info:
Created on..............: 2023-Mar-28.
Expires on..............: 2025-Mar-27.

** Whois Server:
Last Update Time: 2024-12-14T08:18:49+03:00

DNS Records

DNS Lookup Tool

Host	A Record	TTL
ayandon.com.tr	104.21.66.204	300
ayandon.com.tr	172.67.207.63	300

Host	MX Record	Priority	TTL
ayandon.com.tr	mx.yandex.net	10	300

Host	NS Record	TTL
ayandon.com.tr	benedict.ns.cloudflare.com	86400
ayandon.com.tr	marlowe.ns.cloudflare.com	86400

Host	TXT Record	TTL
ayandon.com.tr	google-site-verification=QXQ7v3PxuuFTVNwRiI7RL9m0818B0oP8QR8eWesR8Mk	300
ayandon.com.tr	v=spf1 redirect=_spf.yandex.net	300
ayandon.com.tr	yandex-verification: 8f2ec4c245608cdc	300

benedict.ns.cloudflare.com
TTL: 1800
Email address: dns.cloudflare.com
Serial: 2357705883
Refresh: 10000
Retry: 2400
Expire: 604800
Minimum: 1800

Ayandon.com.tr HTML Validation

HTML Validation Tool

Errors

Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.

Using the “meta” element to specify the document-wide default language is obsolete. Consider specifying the language on the root element instead.

Bad value “cache-control” for attribute “http-equiv” on element “meta”.

No space between attributes.

Attribute “;” not allowed on element “meta” at this point.

Attribute “url” not allowed on element “meta” at this point.

Element “source” is missing required attribute “srcset”.

Bad value “100%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.

Bad value “100%” for attribute “height” on element “img”: Expected a digit but saw “%” instead.

Stray end tag “header”.

The “align” attribute on the “div” element is obsolete. Use CSS instead.

Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.

Attribute “İki” not allowed on element “a” at this point.

Attribute “ölümüz” not allowed on element “a” at this point.

Attribute “var,” not allowed on element “a” at this point.

Attribute “iki” not allowed on element “a” at this point.

Attribute “jandarmamız” not allowed on element “a” at this point.

Attribute “yaralandı""” not allowed on element “a” at this point.

Attribute “İki” not allowed on element “img” at this point.

Attribute “ölümüz” not allowed on element “img” at this point.

Attribute “var,” not allowed on element “img” at this point.

Attribute “iki” not allowed on element “img” at this point.

Attribute “jandarmamız” not allowed on element “img” at this point.

Attribute “yaralandı""” not allowed on element “img” at this point.

Quote “'” in attribute name. Probable cause: Matching quote missing somewhere earlier.

Attribute “dünyanın” not allowed on element “a” at this point.

Attribute “en” not allowed on element “a” at this point.

Attribute “gelişmiş” not allowed on element “a” at this point.

Attribute “İha'larını,” not allowed on element “a” at this point.

Attribute “sİha'larını” not allowed on element “a” at this point.

Attribute “ürettik""” not allowed on element “a” at this point.

Attribute “dünyanın” not allowed on element “img” at this point.

Attribute “en” not allowed on element “img” at this point.

Attribute “gelişmiş” not allowed on element “img” at this point.

Attribute “İha'larını,” not allowed on element “img” at this point.

Attribute “sİha'larını” not allowed on element “img” at this point.

Attribute “ürettik""” not allowed on element “img” at this point.

Attribute “erdoğan” not allowed on element “a” at this point.

Attribute “yereli” not allowed on element “a” at this point.

Attribute “tattı,” not allowed on element “a” at this point.

Attribute “genelde” not allowed on element “a” at this point.

Attribute “seçim” not allowed on element “a” at this point.

Attribute “kaybetmenin” not allowed on element “a” at this point.

Attribute “tadını” not allowed on element “a” at this point.

Attribute “da” not allowed on element “a” at this point.

Attribute “ilk” not allowed on element “a” at this point.

Attribute “sandıkta” not allowed on element “a” at this point.

Attribute “alacak""” not allowed on element “a” at this point.

Attribute “erdoğan” not allowed on element “img” at this point.

Attribute “yereli” not allowed on element “img” at this point.

Attribute “tattı,” not allowed on element “img” at this point.

Attribute “genelde” not allowed on element “img” at this point.

Attribute “seçim” not allowed on element “img” at this point.

Attribute “kaybetmenin” not allowed on element “img” at this point.

Attribute “tadını” not allowed on element “img” at this point.

Attribute “da” not allowed on element “img” at this point.

Attribute “ilk” not allowed on element “img” at this point.

Attribute “sandıkta” not allowed on element “img” at this point.

Attribute “alacak""” not allowed on element “img” at this point.

Attribute “milliyetçiliğimin” not allowed on element “a” at this point.

Attribute “zekatını” not allowed on element “a” at this point.

Attribute “versem” not allowed on element “a” at this point.

Attribute “7” not allowed on element “a” at this point.

Attribute “sülalenize” not allowed on element “a” at this point.

Attribute “40” not allowed on element “a” at this point.

Attribute “sene” not allowed on element “a” at this point.

Attribute “yeter""” not allowed on element “a” at this point.

Attribute “milliyetçiliğimin” not allowed on element “img” at this point.

Attribute “zekatını” not allowed on element “img” at this point.

Attribute “versem” not allowed on element “img” at this point.

Attribute “7” not allowed on element “img” at this point.

Attribute “sülalenize” not allowed on element “img” at this point.

Attribute “40” not allowed on element “img” at this point.

Attribute “sene” not allowed on element “img” at this point.

Attribute “yeter""” not allowed on element “img” at this point.

Attribute “ak” not allowed on element “a” at this point.

Attribute “parti'nin” not allowed on element “a” at this point.

Attribute “iktidara” not allowed on element “a” at this point.

Attribute “gelmesi” not allowed on element “a” at this point.

Attribute “ile” not allowed on element “a” at this point.

Attribute “sağlam” not allowed on element “a” at this point.

Attribute “bir” not allowed on element “a” at this point.

Attribute “mali” not allowed on element “a” at this point.

Attribute “yapının” not allowed on element “a” at this point.

Attribute “temelleri” not allowed on element “a” at this point.

Attribute “atılmıştır""” not allowed on element “a” at this point.

Attribute “ak” not allowed on element “img” at this point.

Attribute “parti'nin” not allowed on element “img” at this point.

Attribute “iktidara” not allowed on element “img” at this point.

Attribute “gelmesi” not allowed on element “img” at this point.

Attribute “ile” not allowed on element “img” at this point.

Attribute “sağlam” not allowed on element “img” at this point.

Attribute “bir” not allowed on element “img” at this point.

Attribute “mali” not allowed on element “img” at this point.

Attribute “yapının” not allowed on element “img” at this point.

Attribute “temelleri” not allowed on element “img” at this point.

Attribute “atılmıştır""” not allowed on element “img” at this point.

Attribute “geçiş” not allowed on element “a” at this point.

Attribute “sürecinde” not allowed on element “a” at this point.

Attribute “suriye'ye” not allowed on element “a” at this point.

Attribute “destek” not allowed on element “a” at this point.

Attribute “vermek stratejik” not allowed on element “a” at this point.

Attribute “zorunluluktur""” not allowed on element “a” at this point.

Attribute “geçiş” not allowed on element “img” at this point.

Attribute “sürecinde” not allowed on element “img” at this point.

Attribute “suriye'ye” not allowed on element “img” at this point.

Attribute “destek” not allowed on element “img” at this point.

Attribute “vermek stratejik” not allowed on element “img” at this point.

Attribute “zorunluluktur""” not allowed on element “img” at this point.

Attribute “biz” not allowed on element “a” at this point.

Attribute “ayrıştırmadık,” not allowed on element “a” at this point.

Attribute “birleştirdik""” not allowed on element “a” at this point.

Attribute “biz” not allowed on element “img” at this point.

Attribute “ayrıştırmadık,” not allowed on element “img” at this point.

Attribute “birleştirdik""” not allowed on element “img” at this point.

Attribute “tüm” not allowed on element “a” at this point.

Attribute “suriyelileri” not allowed on element “a” at this point.

Attribute “temsil” not allowed on element “a” at this point.

Attribute “eden” not allowed on element “a” at this point.

Attribute “hükümeti” not allowed on element “a” at this point.

Attribute “kurmanın” not allowed on element “a” at this point.

Attribute “zamanı''"” not allowed on element “a” at this point.

Attribute “tüm” not allowed on element “img” at this point.

Attribute “suriyelileri” not allowed on element “img” at this point.

Attribute “temsil” not allowed on element “img” at this point.

Attribute “eden” not allowed on element “img” at this point.

Attribute “hükümeti” not allowed on element “img” at this point.

Attribute “kurmanın” not allowed on element “img” at this point.

Attribute “zamanı''"” not allowed on element “img” at this point.

Attribute “sayın” not allowed on element “a” at this point.

Attribute “edoğan” not allowed on element “a” at this point.

Attribute “2024” not allowed on element “a” at this point.

Attribute “yılını” not allowed on element “a” at this point.

Attribute “'emekliler” not allowed on element “a” at this point.

Attribute “yılı'” not allowed on element “a” at this point.

Attribute “ilan” not allowed on element “a” at this point.

Attribute “etmişti,” not allowed on element “a” at this point.

Attribute “etmez” not allowed on element “a” at this point.

Attribute “olaydı""” not allowed on element “a” at this point.

Attribute “sayın” not allowed on element “img” at this point.

Attribute “edoğan” not allowed on element “img” at this point.

Attribute “2024” not allowed on element “img” at this point.

Attribute “yılını” not allowed on element “img” at this point.

Attribute “'emekliler” not allowed on element “img” at this point.

Attribute “yılı'” not allowed on element “img” at this point.

Attribute “ilan” not allowed on element “img” at this point.

Attribute “etmişti,” not allowed on element “img” at this point.

Attribute “etmez” not allowed on element “img” at this point.

Attribute “olaydı""” not allowed on element “img” at this point.

Attribute “zalim” not allowed on element “a” at this point.

Attribute “esed” not allowed on element “a” at this point.

Attribute “rejimiyle” not allowed on element “a” at this point.

Attribute “beraber” not allowed on element “a” at this point.

Attribute “kaybetmiştir” not allowed on element “a” at this point.

Attribute “ ""” not allowed on element “a” at this point.

Attribute “zalim” not allowed on element “img” at this point.

Attribute “esed” not allowed on element “img” at this point.

Attribute “rejimiyle” not allowed on element “img” at this point.

Attribute “beraber” not allowed on element “img” at this point.

Attribute “kaybetmiştir” not allowed on element “img” at this point.

Attribute “ ""” not allowed on element “img” at this point.

Attribute “türkiye'nin” not allowed on element “a” at this point.

Attribute “suriye'deki” not allowed on element “a” at this point.

Attribute “varlığı” not allowed on element “a” at this point.

Attribute “meşrudur,” not allowed on element “a” at this point.

Attribute “hukukidir,” not allowed on element “a” at this point.

Attribute “gereklidir""” not allowed on element “a” at this point.

Attribute “türkiye'nin” not allowed on element “img” at this point.

Attribute “suriye'deki” not allowed on element “img” at this point.

Attribute “varlığı” not allowed on element “img” at this point.

Attribute “meşrudur,” not allowed on element “img” at this point.

Attribute “hukukidir,” not allowed on element “img” at this point.

Attribute “gereklidir""” not allowed on element “img” at this point.

Attribute “israrla” not allowed on element “a” at this point.

Attribute “gitmeye” not allowed on element “a” at this point.

Attribute “devam” not allowed on element “a” at this point.

Attribute “edeceğim""” not allowed on element “a” at this point.

Attribute “israrla” not allowed on element “img” at this point.

Attribute “gitmeye” not allowed on element “img” at this point.

Attribute “devam” not allowed on element “img” at this point.

Attribute “edeceğim""” not allowed on element “img” at this point.

Attribute “alt” not allowed on element “svg” at this point.

“=” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.

Element “img” is missing required attribute “src”.

Stray end tag “div”.

Warnings

Attribute “;” is not serializable as XML 1.0.

The “type” attribute is unnecessary for JavaScript resources.

Attribute “var,” is not serializable as XML 1.0.

Attribute “yaralandı""” is not serializable as XML 1.0.

Attribute “İha'larını,” is not serializable as XML 1.0.

Attribute “sİha'larını” is not serializable as XML 1.0.

Attribute “ürettik""” is not serializable as XML 1.0.

Attribute “tattı,” is not serializable as XML 1.0.

Attribute “alacak""” is not serializable as XML 1.0.

Attribute “7” is not serializable as XML 1.0.

Attribute “40” is not serializable as XML 1.0.

Attribute “yeter""” is not serializable as XML 1.0.

Attribute “parti'nin” is not serializable as XML 1.0.

Attribute “atılmıştır""” is not serializable as XML 1.0.

Attribute “suriye'ye” is not serializable as XML 1.0.

Attribute “vermek stratejik” is not serializable as XML 1.0.

Attribute “zorunluluktur""” is not serializable as XML 1.0.

Attribute “ayrıştırmadık,” is not serializable as XML 1.0.

Attribute “birleştirdik""” is not serializable as XML 1.0.

Attribute “zamanı''"” is not serializable as XML 1.0.

Attribute “2024” is not serializable as XML 1.0.

Attribute “'emekliler” is not serializable as XML 1.0.

Attribute “yılı'” is not serializable as XML 1.0.

Attribute “etmişti,” is not serializable as XML 1.0.

Attribute “olaydı""” is not serializable as XML 1.0.

Attribute “ ""” is not serializable as XML 1.0.

Attribute “türkiye'nin” is not serializable as XML 1.0.

Attribute “suriye'deki” is not serializable as XML 1.0.

Attribute “meşrudur,” is not serializable as XML 1.0.

Attribute “hukukidir,” is not serializable as XML 1.0.

Attribute “gereklidir""” is not serializable as XML 1.0.

Attribute “edeceğim""” is not serializable as XML 1.0.

NON-DOCUMENT-ERROR

Oops. That was not supposed to happen. A bug manifested itself in the application internals. Unable to continue. Sorry. The admin was notified.

Ayandon.com.tr Typos

www.ayandon.com
www.ayandon.net
www.ayandon.org
www.ayandon.info
www.ayandon.biz
www.ayandon.us
www.ayandon.mobi
www.yandon.com.tr
www.ayandon.com.tr
www.qyandon.com.tr
www.aqyandon.com.tr
www.qayandon.com.tr
www.wyandon.com.tr
www.awyandon.com.tr
www.wayandon.com.tr
www.syandon.com.tr
www.asyandon.com.tr
www.sayandon.com.tr
www.zyandon.com.tr
www.azyandon.com.tr
www.zayandon.com.tr
www.aandon.com.tr
www.atandon.com.tr
www.aytandon.com.tr
www.atyandon.com.tr
www.agandon.com.tr
www.aygandon.com.tr
www.agyandon.com.tr
www.ahandon.com.tr
www.ayhandon.com.tr
www.ahyandon.com.tr
www.auandon.com.tr
www.ayuandon.com.tr
www.auyandon.com.tr
www.ayndon.com.tr
www.ayqndon.com.tr
www.ayaqndon.com.tr
www.ayqandon.com.tr
www.aywndon.com.tr
www.ayawndon.com.tr
www.aywandon.com.tr
www.aysndon.com.tr
www.ayasndon.com.tr
www.aysandon.com.tr
www.ayzndon.com.tr
www.ayazndon.com.tr
www.ayzandon.com.tr
www.ayadon.com.tr
www.ayabdon.com.tr
www.ayanbdon.com.tr
www.ayabndon.com.tr
www.ayahdon.com.tr
www.ayanhdon.com.tr
www.ayahndon.com.tr
www.ayajdon.com.tr
www.ayanjdon.com.tr
www.ayajndon.com.tr
www.ayamdon.com.tr
www.ayanmdon.com.tr
www.ayamndon.com.tr
www.ayanon.com.tr
www.ayanxon.com.tr
www.ayandxon.com.tr
www.ayanxdon.com.tr
www.ayanson.com.tr
www.ayandson.com.tr
www.ayansdon.com.tr
www.ayaneon.com.tr
www.ayandeon.com.tr
www.ayanedon.com.tr
www.ayanron.com.tr
www.ayandron.com.tr
www.ayanrdon.com.tr
www.ayanfon.com.tr
www.ayandfon.com.tr
www.ayanfdon.com.tr
www.ayancon.com.tr
www.ayandcon.com.tr
www.ayancdon.com.tr
www.ayandn.com.tr
www.ayandin.com.tr
www.ayandoin.com.tr
www.ayandion.com.tr
www.ayandkn.com.tr
www.ayandokn.com.tr
www.ayandkon.com.tr
www.ayandln.com.tr
www.ayandoln.com.tr
www.ayandlon.com.tr
www.ayandpn.com.tr
www.ayandopn.com.tr
www.ayandpon.com.tr
www.ayando.com.tr
www.ayandob.com.tr
www.ayandonb.com.tr
www.ayandobn.com.tr
www.ayandoh.com.tr
www.ayandonh.com.tr
www.ayandohn.com.tr
www.ayandoj.com.tr
www.ayandonj.com.tr
www.ayandojn.com.tr
www.ayandom.com.tr
www.ayandonm.com.tr
www.ayandomn.com.tr

Ayandon.com.tr Ayandon | Haber Fırtınası

Haberler, son dakika haberleri, siyasi haberler, ekonomi haberleri, spor haberleri, gündem haberleri, savunma haberleri, köşe yazarları ve daha fazlas...

Quick Summary

Ayandon.com.tr General Information

Ayandon.com.tr Alexa Rank History

Ayandon.com.tr Safety Information

Ayandon.com.tr Server Information

Ayandon.com.tr Domain Name Information

Ayandon.com.tr HTML Validation

Ayandon.com.tr Nearest Competitors

Ayandon.com.tr Typos