51jr.net - robtex.com

51jr.net

DNSSEC⚠️ Not signed
A2606:4700:3031::6815:56a6🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:de62🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.86.166Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.222.98🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSkareem.ns.cloudflare.com ⭐
A2606:4700:58::a29f:2c16🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRkareem.ns.cloudflare.com
A2803:f800:50::6ca2:c316🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRkareem.ns.cloudflare.com
A2a06:98c1:50::ac40:2316🇺🇸 Cloudflare2a06:98c1:50::/45
PTRkareem.ns.cloudflare.com
A108.162.195.22🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRkareem.ns.cloudflare.com
A162.159.44.22Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRkareem.ns.cloudflare.com
A172.64.35.22🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRkareem.ns.cloudflare.com
NSsydney.ns.cloudflare.com
A2606:4700:50::a29f:2666🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsydney.ns.cloudflare.com
A2803:f800:50::6ca2:c266🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRsydney.ns.cloudflare.com
A2a06:98c1:50::ac40:2266🇺🇸 Cloudflare2a06:98c1:50::/45
PTRsydney.ns.cloudflare.com
A108.162.194.102🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsydney.ns.cloudflare.com
A162.159.38.102Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsydney.ns.cloudflare.com
A172.64.34.102🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRsydney.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.86.166, 172.67.222.98
IPv6 hints2606:4700:3031::6815:56a6, 2606:4700:3035::ac43:de62
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=137, name=cloudflare-ech.com
SOAkareem.ns.cloudflare.comdns@cloudflare.com serial=2403212600

net

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1778583671

Subdomains

www.51jr.net

Same first word

51jr.com
51jr.net

Similar names

rj15.com
rj15.cn

DNS History

12 records (6 active, 6 former)

20162017201820192020202120222023202420252026NSkareem.ns.cloudflare.comsydney.ns.cloudflare.comns1.myhostadmin.netns2.myhostadmin.netns3.myhostadmin.netns4.myhostadmin.netns5.myhostadmin.netns6.myhostadmin.netA104.21.86.166172.67.222.982606:4700:3031::6815:56a62606:4700:3035::ac43:de62
●NSkareem.ns.cloudflare.com2026-05-08 → 2026-05-12 · 3 obs
○ 2015-08-10 07:11:44
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40
○NSns1.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
○NSns2.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
○NSns3.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
○NSns4.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
○NSns5.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
○NSns6.myhostadmin.net2015-08-10 → 2015-08-10 · 3 obs
● 2015-08-10 07:11:44
○ 2026-05-08 05:48:14
○ 2026-05-12 11:23:40
●NSsydney.ns.cloudflare.com2026-05-08 → 2026-05-12 · 3 obs
○ 2015-08-10 07:11:44
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40
●A104.21.86.1662026-05-08 → 2026-05-12 · 2 obs
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40
●A172.67.222.982026-05-08 → 2026-05-12 · 2 obs
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40
●A2606:4700:3031::6815:56a62026-05-08 → 2026-05-12 · 2 obs
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40
●A2606:4700:3035::ac43:de622026-05-08 → 2026-05-12 · 2 obs
● 2026-05-08 05:48:14
● 2026-05-12 11:23:40

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
neta.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...-
51jr.netsydney.ns.cloudflare.com, kareem.ns.cloudflare.com-

✅ Authoritative Response

Server:162.159.38.102

NS records: sydney.ns.cloudflare.com, kareem.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51jr.net (unsigned zone)

⏱️ Timing

Total: 1093ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.222.98, 104.21.86.166
AAAA22606:4700:3035::ac43:de62, 2606:4700:3031::6815:56a6
NS2kareem.ns.cloudflare.com, sydney.ns.cloudflare.com
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1kareem.ns.cloudflare.com dns.cloudflare.

Analysis

Hierarchy

51jr.net is the parent of www.51jr.net.

IP Addresses

Four IP numbers are pointed to by 51jr.net: 2606:4700:3031::6815:56a6, 2606:4700:3035::ac43:de62, 104.21.86.166 and 172.67.222.98.

other host names including el(0x6c6f6c697461).com, llanelli-history.co.uk, b.hongxuyen.edu.vn, andiyang.com and polskie(0x706f726e)o.(0x787878) share IP numbers with 51jr.net.

Name Servers

51jr.net is delegated to two name servers kareem.ns.cloudflare.com and sydney.ns.cloudflare.com.

51jr.net shares the same name server setup as other domains, for instance bjwjrc.com, zbzhengyu.com, dzchuangyi.net, x2273.com and anguoo.com.

51jr.net at least partially shares name servers with other domains, for instance chirurgiafegatoverona.it, server-kicker.de, drsatishrudrappa.com, briefingtoday.com and vobg.net.

these name servers are often used together with kipp.ns.cloudflare.com, liz.ns.cloudflare.com, cesar.ns.cloudflare.com and sneh.ns.cloudflare.com.

Host names with six IP numbers:

Host name kareem.ns.cloudflare.com points to: 2606:4700:58::a29f:2c16, 2803:f800:50::6ca2:c316, 2a06:98c1:50::ac40:2316, 108.162.195.22, 162.159.44.22 and 172.64.35.22.

Host name sydney.ns.cloudflare.com points to: 2606:4700:50::a29f:2666, 2803:f800:50::6ca2:c266, 2a06:98c1:50::ac40:2266, 108.162.194.102, 162.159.38.102 and 172.64.34.102.