51study.org - dns.ninja

51study.org

DNSSEC⚠️ Not signed
A2606:4700:3032::6815:1aa2🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:8932🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.26.162Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.137.50🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSignacio.ns.cloudflare.com ⭐
A2606:4700:58::a29f:2c52🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRignacio.ns.cloudflare.com
A2803:f800:50::6ca2:c352🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRignacio.ns.cloudflare.com
A2a06:98c1:50::ac40:2352🇺🇸 Cloudflare2a06:98c1:50::/45
PTRignacio.ns.cloudflare.com
A108.162.195.82🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRignacio.ns.cloudflare.com
A162.159.44.82Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRignacio.ns.cloudflare.com
A172.64.35.82🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRignacio.ns.cloudflare.com
NSmiki.ns.cloudflare.com
A2606:4700:50::adf5:3aca🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRmiki.ns.cloudflare.com
A2803:f800:50::6ca2:c0ca🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRmiki.ns.cloudflare.com
A2a06:98c1:50::ac40:20ca🇺🇸 Cloudflare2a06:98c1:50::/45
PTRmiki.ns.cloudflare.com
A108.162.192.202🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRmiki.ns.cloudflare.com
A172.64.32.202🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRmiki.ns.cloudflare.com
A173.245.58.202🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRmiki.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.26.162, 172.67.137.50
IPv6 hints2606:4700:3032::6815:1aa2, 2606:4700:3035::ac43:8932
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=148, name=cloudflare-ech.com
SOAignacio.ns.cloudflare.comdns@cloudflare.com serial=2407459387

org

DNSSEC🔒 Signed (DS record present)
NSa0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation
NSa2.org.afilias-nst.info ⚠️ Not in parent delegation
NSb0.org.afilias-nst.org
NSb2.org.afilias-nst.org
NSc0.org.afilias-nst.info ⚠️ Not in parent delegation
NSd0.org.afilias-nst.org
SOAa0.org.afilias-nst.infohostmaster@donuts.email serial=1783944830

Same first word

51study.net.cn
51study.org
51study.net
51study.com

DNS History

16 records (6 active, 10 former)

20162017201820192020202120222023202420252026NSignacio.ns.cloudflare.commiki.ns.cloudflare.comns15.xincache.comns16.xincache.comMXmxbiz1.qq.commxbiz2.qq.comA104.21.26.162172.67.137.502606:4700:3032::6815:1aa22606:4700:3035::ac43:8932188.114.96.0188.114.97.02606:4700:3036::ac43:89322606:4700:3037::6815:1aa22a06:98c1:3120::2a06:98c1:3121::
●NSignacio.ns.cloudflare.com2026-05-25 → 2026-07-13 · 3 obs
○ 2017-06-02 08:30:50
● 2026-05-25 21:07:20
● 2026-07-13 12:39:14
●NSmiki.ns.cloudflare.com2026-05-25 → 2026-07-13 · 3 obs
○ 2017-06-02 08:30:50
● 2026-05-25 21:07:20
● 2026-07-13 12:39:14
○NSns15.xincache.com2015-06-04 → 2017-06-02 · 4 obs
● 2015-06-04 08:16:22
● 2017-06-02 08:30:50
○ 2026-05-25 21:07:20
○ 2026-07-13 12:39:14
○NSns16.xincache.com2015-06-04 → 2017-06-02 · 4 obs
● 2015-06-04 08:16:22
● 2017-06-02 08:30:50
○ 2026-05-25 21:07:20
○ 2026-07-13 12:39:14
○MXmxbiz1.qq.com2015-10-23 → 2017-06-02 · 4 obs
● 2015-10-23 02:17:40
● 2017-06-02 08:30:50
○ 2026-05-25 21:07:20
○ 2026-07-13 12:39:14
○MXmxbiz2.qq.com2015-10-23 → 2017-06-02 · 4 obs
● 2015-10-23 02:17:40
● 2017-06-02 08:30:50
○ 2026-05-25 21:07:20
○ 2026-07-13 12:39:14
●A104.21.26.1622026-05-25 → 2026-07-13 · 4 obs
● 2026-05-25 21:07:20
● 2026-06-13 15:38:02
○ 2026-07-02 05:20:28
● 2026-07-13 12:39:14
●A172.67.137.502026-05-25 → 2026-07-13 · 4 obs
● 2026-05-25 21:07:20
● 2026-06-13 15:38:02
○ 2026-07-02 05:20:28
● 2026-07-13 12:39:14
○A188.114.96.02026-07-02 → 2026-07-02 · 3 obs
○ 2026-06-13 15:38:02
● 2026-07-02 05:20:28
○ 2026-07-13 12:39:14
○A188.114.97.02026-07-02 → 2026-07-02 · 3 obs
○ 2026-06-13 15:38:02
● 2026-07-02 05:20:28
○ 2026-07-13 12:39:14
●A2606:4700:3032::6815:1aa22026-07-13 → 2026-07-13 · 2 obs
○ 2026-07-02 05:20:28
● 2026-07-13 12:39:14
●A2606:4700:3035::ac43:89322026-07-13 → 2026-07-13 · 2 obs
○ 2026-07-02 05:20:28
● 2026-07-13 12:39:14
○A2606:4700:3036::ac43:89322026-05-25 → 2026-06-13 · 4 obs
● 2026-05-25 21:07:20
● 2026-06-13 15:38:02
○ 2026-07-02 05:20:28
○ 2026-07-13 12:39:14
○A2606:4700:3037::6815:1aa22026-05-25 → 2026-06-13 · 4 obs
● 2026-05-25 21:07:20
● 2026-06-13 15:38:02
○ 2026-07-02 05:20:28
○ 2026-07-13 12:39:14
○A2a06:98c1:3120::2026-07-02 → 2026-07-02 · 3 obs
○ 2026-06-13 15:38:02
● 2026-07-02 05:20:28
○ 2026-07-13 12:39:14
○A2a06:98c1:3121::2026-07-02 → 2026-07-02 · 3 obs
○ 2026-06-13 15:38:02
● 2026-07-02 05:20:28
○ 2026-07-13 12:39:14

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
orgb0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org-
51study.orgignacio.ns.cloudflare.com, miki.ns.cloudflare.com-

✅ Authoritative Response

Server:108.162.195.82

NS records: ignacio.ns.cloudflare.com, miki.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51study.org (unsigned zone)

⏱️ Timing

Total: 370ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.26.162, 172.67.137.50
AAAA22606:4700:3032::6815:1aa2, 2606:4700:3035::ac43:8932
NS2ignacio.ns.cloudflare.com, miki.ns.cloudflare.com
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1ignacio.ns.cloudflare.com dns.cloudflare

Analysis

IP Addresses

51study.org points to the four IP addresses 104.21.26.162, 172.67.137.50, 2606:4700:3032::6815:1aa2 and 2606:4700:3035::ac43:8932.

Additional host names — 561tyq.com, albertainjurylaw.com, mail.govarrestrecords.org and two others — share IP numbers with 51study.org.

Name Servers

51study.org is served by two delegated name servers, ignacio.ns.cloudflare.com and miki.ns.cloudflare.com.

51study.org shares its name server setup with other domains, including longfaibus.com, amg-news.com, whmos.com and two others.

There is at least partial name server overlap between 51study.org and other domains — reykjavikattractions.is, arborvitae.xyz, chronovialentia.sbs and two more among them.

These name servers tend to appear in combination with the name servers aleena.ns.cloudflare.com, austin.ns.cloudflare.com, kelly.ns.cloudflare.com and mia.ns.cloudflare.com.

Host names with 6 IP numbers:

ignacio.ns.cloudflare.com carries IP addresses 108.162.195.82, 162.159.44.82 and 172.64.35.82, with 3 other addresses beyond those.

miki.ns.cloudflare.com carries IP addresses 108.162.192.202, 172.64.32.202 and 173.245.58.202, with 3 other addresses beyond those.