51studyok.com - dns.ninja
51studyok.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 210.209.94.121🇭🇰 HKBN210.209.64.0/19 New World Telecommunications Limited Hong Kong Broadband Network Ltd 15/F, Trans Asia Centre 18 Kin Hong Street, Kwai Chung, N.T. | ||||||
| PTR | 210209094121.ctinets.com | ||||||
| NS | ns19.domaincontrol.com ⭐ | ||||||
| A | 2603:5:21d0::a🇺🇸 GODADDY-DNS2603:5:21d0::/44 | ||||||
| PTR | ns19.domaincontrol.com | ||||||
| A | 97.74.109.10🇺🇸 GODADDY-DNS97.74.108.0/23 | ||||||
| PTR | ns19.domaincontrol.com | ||||||
| NS | ns20.domaincontrol.com | ||||||
| A | 2603:5:22d0::a🇺🇸 GODADDY-DNS2603:5:22d0::/44 | ||||||
| PTR | ns20.domaincontrol.com | ||||||
| A | 173.201.77.10🇺🇸 GODADDY-DNS173.201.76.0/23 | ||||||
| PTR | ns20.domaincontrol.com | ||||||
| MX | smtp.secureserver.net ⭐ | ||||||
| A | 216.69.141.71🇺🇸 AS398101216.69.140.0/22 | ||||||
| PTR | osplibsmtp01-v01.prod.phx3.secureserver.net | ||||||
| A | 216.69.141.84🇺🇸 AS398101216.69.140.0/22 | ||||||
| PTR | osplibsmtp02-v01.prod.phx3.secureserver.net | ||||||
| A | 216.69.141.113🇺🇸 AS398101216.69.140.0/22 | ||||||
| PTR | osplibsmtp03-v01.prod.phx3.secureserver.net | ||||||
| MX | mail3.myhostadmin.net(10) | ||||||
| A | 211.149.243.214🇨🇳 CHINANET-SCIDC-AS-AP211.149.224.0/19 chinanet SC province network-client | ||||||
| SOA | ns19.domaincontrol.comdns@jomax.net 2026-04-20 #1 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1782062935 | ||||||
Same first word
51studyok.com |
DNS History
5 records (5 active, 0 former)
●NSns19.domaincontrol.com2015-07-24 → 2026-06-21 · 2 obs
● 2026-06-21 17:55:20
●NSns20.domaincontrol.com2015-07-24 → 2026-06-21 · 2 obs
● 2026-06-21 17:55:20
●MXmail3.myhostadmin.net2015-07-24 → 2026-06-21 · 2 obs
● 2026-06-21 17:55:20
●MXsmtp.secureserver.net2015-07-24 → 2026-06-21 · 2 obs
● 2026-06-21 17:55:20
●A210.209.94.1212015-07-24 → 2026-06-21 · 2 obs
● 2026-06-21 17:55:20
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| 51studyok.com | ns19.domaincontrol.com, ns20.domaincontrol.com | 4 records |
✅ Authoritative Response
Server:173.201.77.10
NS records: ns19.domaincontrol.com, ns20.domaincontrol.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 51studyok.com (unsigned zone)
⏱️ Timing
Total: 127ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 210.209.94.121 |
| NS | 2 | ns19.domaincontrol.com, ns20.domaincontrol.com |
| MX | 2 | mail3.myhostadmin.net (pri: 10), smtp.secureserver.net (pri: 0) |
| SOA | 1 | ns19.domaincontrol.com dns.jomax.net |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns19.domaincontrol.com, ns19.domaincontrol.com, ns20.domaincontrol.com...)
Analysis
IP Addresses
51studyok.com has exactly one IP address — 210.209.94.121.
Host names like 210209094121.ctinets.com are further examples that share IP numbers with 51studyok.com.
Name Servers
Two name servers handle the delegation for 51studyok.com: ns19.domaincontrol.com and ns20.domaincontrol.com.
The name server configuration of 51studyok.com is shared with other domains, for instance vj-lab.com, compactcompression.com, pursesuit.com and two others.
51studyok.com is at least partially co-delegated on name servers with other domains, such as aprilnine.com.
ns19.domaincontrol.com and ns20.domaincontrol.com both carry two IP addresses. The A records for ns19.domaincontrol.com are 97.74.109.10 and 2603:5:21d0::a; the A records for ns20.domaincontrol.com are 173.201.77.10 and 2603:5:22d0::a.
Mail Servers
51studyok.com uses two mail servers, mail3.myhostadmin.net and smtp.secureserver.net.
At least some of the mail servers used by 51studyok.com are shared with other domains: queenswayclinic.com, cd-dc.com, theweatherchannelkids.net and two others among them.
These mail servers tend to be used in conjunction with the mail servers mailstore1.secureserver.net.
Host names carrying three IP numbers:
The hostname smtp.secureserver.net points to 216.69.141.71, 216.69.141.84 and 216.69.141.113.
Host names resolving to a single IP address:
The hostname mail3.myhostadmin.net resolves to 211.149.243.214.