51openclass.com - robtex.com

51openclass.com

DNSSEC⚠️ Not signed
A156.225.134.240🇭🇰 HKIDC-AS-AP156.225.132.0/22 CloudFly Net Inc
NSa6.share-dns.com ⭐ ⚠️ Not in parent delegation
A172.64.53.25🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSa.share-dns.com ⚠️ Not in zone NS records
A172.64.53.25🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSb.share-dns.net ⚠️ Not in zone NS records
A172.64.52.239🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
NSb6.share-dns.net ⚠️ Not in parent delegation
A172.64.52.239🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
SOAa.share-dns.commaster@share-dns.com serial=1771518249

com

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=1774589672

Same first word

51openclass.com

DNS History

9 records (5 active, 4 former)

2017201820192020202120222023202420252026NSa.share-dns.coma6.share-dns.comb.share-dns.netb6.share-dns.neta7.share-dns.comb7.share-dns.netdns10.hichina.comdns9.hichina.comA156.225.134.240
●NSa.share-dns.com2026-03-15 → 2026-03-27 · 3 obs
○ 2017-09-03 19:38:32
● 2026-03-15 02:53:54
● 2026-03-27 05:59:58
●NSa6.share-dns.com2026-03-27 → 2026-03-27 · 2 obs
○ 2026-03-18 09:35:48
● 2026-03-27 05:59:58
○NSa7.share-dns.com2026-03-15 → 2026-03-18 · 4 obs
○ 2017-09-03 19:38:32
● 2026-03-15 02:53:54
● 2026-03-18 09:35:48
○ 2026-03-27 05:59:58
●NSb.share-dns.net2026-03-15 → 2026-03-27 · 3 obs
○ 2017-09-03 19:38:32
● 2026-03-15 02:53:54
● 2026-03-27 05:59:58
●NSb6.share-dns.net2026-03-27 → 2026-03-27 · 2 obs
○ 2026-03-18 09:35:48
● 2026-03-27 05:59:58
○NSb7.share-dns.net2026-03-15 → 2026-03-18 · 4 obs
○ 2017-09-03 19:38:32
● 2026-03-15 02:53:54
● 2026-03-18 09:35:48
○ 2026-03-27 05:59:58
○NSdns10.hichina.com2016-12-15 → 2016-12-15 · 3 obs
● 2016-12-15 17:26:02
○ 2017-09-03 19:38:32
○ 2026-03-27 05:59:58
○NSdns9.hichina.com2016-12-15 → 2016-12-15 · 3 obs
● 2016-12-15 17:26:02
○ 2017-09-03 19:38:32
○ 2026-03-27 05:59:58
●A156.225.134.2402026-03-15 → 2026-03-27 · 2 obs
● 2026-03-15 02:53:54
● 2026-03-27 05:59:58

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comk.gtld-servers.net, e.gtld-servers.net, i.gtld-servers.net, b.gtld-servers.net...-
51openclass.comb6.share-dns.net, a6.share-dns.com1 record

✅ Authoritative Response

Server:172.64.53.25

NS records: b6.share-dns.net, a6.share-dns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51openclass.com (unsigned zone)

⏱️ Timing

Total: 304ms | Queries: -

📄 Records

TypeCountSample Data
A1156.225.134.240
NS2a.share-dns.com, b.share-dns.net
SOA1a.share-dns.com master.share-dns.com

📌 Glue Records Collected

Total: 1

Out-of-bailiwick: 1 (a6.share-dns.com)

Analysis

IP Addresses

51openclass.com points to a single IP: 156.225.134.240.

Other host names, for instance czzajx.com, gdhangzhao.com, bjlywltx.com, sena11d.cn and yanzhizhujue.com share IP numbers with 51openclass.com.

Name Servers

51openclass.com's delegation is handled by four name servers: a6.share-dns.com, a.share-dns.com, b6.share-dns.net and b.share-dns.net.

51openclass.com partially shares name servers with other domains; examples include ynlnyx.com, thaibuyweb.com, xiaopanggou.com, mnikxdc.cn and hndjk.com.

These name servers are commonly used alongside a9.share-dns.com, b9.share-dns.net, a12.share-dns.com, b12.share-dns.net, a4.share-dns.com, b4.share-dns.net, a3.share-dns.com, b3.share-dns.net, a5.share-dns.com and b5.share-dns.net.

Host names sharing a single IP address:

a6.share-dns.com points to: 172.64.53.25.

a.share-dns.com points to: 172.64.53.25.

b6.share-dns.net points to: 172.64.52.239.

b.share-dns.net points to: 172.64.52.239.

Host names pointing to 172.64.53.25: a6.share-dns.com and a.share-dns.com.

Host names pointing to 172.64.52.239: b6.share-dns.net and b.share-dns.net.