21st.dev 21st.dev – Craft with AI
Craft with AI. Build with your team's taste.
Server IP address resolved: Yes
Http response code: 200
Response time: 0.23 sec.
Last Checked: 08/17/2025
21st.dev receives about 1,530 unique visitors and 3,060 pageviews per day. The estimated value of 21st.dev is 2,160 USD. Each unique visitor makes about 2 pageviews on average.
21st.dev is registered under .DEV top-level domain. Check other websites in .DEV zone.
At the time of the last check (August 17, 2025) 21st.dev has an expired SSL certificate issued by Let's Encrypt (expired on September 25, 2025). Check other websites using SSL certificates issued by Let's Encrypt.
According to Symantec 21st.dev is quite a safe domain.
Not tested yet
Alexa Rank shows how popular 21st.dev is in comparison with other sites. The most popular site has Alexa Rank equals 1. If 21st.dev 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 21st.dev and pageviews on 21st.dev over the past 3 months.
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 ConnectSafe evaluates 21st.dev for any unsafe and insecure content. The results are critical for families with young children.
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.
McAfee assesses 21st.dev 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 21st.dev for mature or inappropriate content, only security checks are evaluated.
The WOT calculates reputation of the 21st.dev. This reputation system receives ratings from users and information from third-party sources, assesses the 21st.dev for safety features and confirms, whether 21st.dev is suitable for children.
| Domain | 21st.dev |
| Issuer Organization | Let's Encrypt |
| Issuer | R11 |
| Algorithm | RSA-SHA256 |
| Valid form | 06/27/2025 |
| Expiration | 09/25/2025 |
| Signed | Certificate is not self signed |
| Additional Domains | 21st.dev |
ASN ID: 16509
ASN Title: AMAZON-02 - Amazon.com, Inc., US
Last Update: 08/17/2025
#
# 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: 16509
ASName: AMAZON-02
ASHandle: AS16509
RegDate: 2000-05-03
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/16509
OrgName: Amazon.com, Inc.
OrgId: AMAZON-4
Address: 1918 8th Ave
City: SEATTLE
StateProv: WA
PostalCode: 98101-1244
Country: US
RegDate: 1995-01-23
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/AMAZON-4
OrgAbuseHandle: AEA8-ARIN
OrgAbuseName: Amazon EC2 Abuse
OrgAbusePhone: +1-206-266-4064
OrgAbuseEmail: abuse@amazonaws.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/AEA8-ARIN
OrgTechHandle: ANO24-ARIN
OrgTechName: Amazon EC2 Network Operations
OrgTechPhone: +1-206-266-4064
OrgTechEmail: amzn-noc-contact@amazon.com
OrgTechRef: https://rdap.arin.net/registry/entity/ANO24-ARIN
RTechHandle: AC6-ORG-ARIN
RTechName: Amazon-com Incorporated
RTechPhone: +1-206-266-2187
RTechEmail: ipmanagement@amazon.com
RTechRef: https://rdap.arin.net/registry/entity/AC6-ORG-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.
#
21st.dev domain is not supported
| Host | A Record | TTL |
|---|---|---|
| 21st.dev | 76.76.21.21 | 300 |
| Host | MX Record | Priority | TTL |
|---|---|---|---|
| 21st.dev | aspmx.l.google.com | 1 | 3600 |
| 21st.dev | alt3.aspmx.l.google.com | 10 | 3600 |
| 21st.dev | alt4.aspmx.l.google.com | 10 | 3600 |
| 21st.dev | alt1.aspmx.l.google.com | 5 | 3600 |
| 21st.dev | alt2.aspmx.l.google.com | 5 | 3600 |
| Host | NS Record | TTL |
|---|---|---|
| 21st.dev | troy.ns.cloudflare.com | 86400 |
| 21st.dev | wanda.ns.cloudflare.com | 86400 |
| Host | TXT Record | TTL |
|---|---|---|
| 21st.dev | google-site-verification=YFpWIJMGkNWwROIBi6k4tCDond42AzcwikvbTcaAkEs | 300 |
| 21st.dev | google-site-verification=hTyRw-FMAZobiHchBR0i-AmZAJ3U3l8CLEU8wldCH40 | 300 |
| 21st.dev | pinterest-site-verification=b11e052f8527ba192c895ae949b5435b | 300 |
| 21st.dev | v=spf1 include:spf.improvmx.com include:_spf.google.com ~all | 300 |
troy.ns.cloudflare.com
TTL: 1800
Email address: dns.cloudflare.com
Serial: 2380780845
Refresh: 10000
Retry: 2400
Expire: 604800
Minimum: 1800
not found
www.21st.net
www.21st.org
www.21st.info
www.21st.biz
www.21st.us
www.21st.mobi
www.1st.dev
www.21st.dev
www.2st.dev
www.21t.dev
www.21wt.dev
www.21swt.dev
www.21wst.dev
www.21et.dev
www.21set.dev
www.21est.dev
www.21dt.dev
www.21sdt.dev
www.21dst.dev
www.21zt.dev
www.21szt.dev
www.21zst.dev
www.21xt.dev
www.21sxt.dev
www.21xst.dev
www.21at.dev
www.21sat.dev
www.21ast.dev
www.21s.dev
www.21sr.dev
www.21str.dev
www.21srt.dev
www.21sf.dev
www.21stf.dev
www.21sft.dev
www.21sg.dev
www.21stg.dev
www.21sgt.dev
www.21sy.dev
www.21sty.dev
www.21syt.dev