51cnedu.com - robtex.com
51cnedu.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 38.55.102.205🇭🇰 VMISS38.55.102.0/24 Proxy-registered route object | ||||||
| NS | ns1.julydns.com ⭐ ⚠️ Not in parent delegation | ||||||
| A | 162.159.48.223Cloudflare162.159.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| NS | ns1.onclouddns.com ⚠️ Not in zone NS records | ||||||
| A | 162.159.27.251Cloudflare162.159.27.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| NS | ns2.julydns.com ⚠️ Not in parent delegation | ||||||
| A | 162.159.48.223Cloudflare162.159.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| NS | ns2.onclouddns.com ⚠️ Not in zone NS records | ||||||
| A | 162.159.27.251Cloudflare162.159.27.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| SOA | ns1.julydns.commaster@jmdns.com serial=1785347665 | ||||||
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=1785412392 | ||||||
Subdomains
mail.51cnedu.com |
Same first word
51cnedu.com |
DNS History
22 records (5 active, 17 former)
○NSjuming.dnsdun.com2017-05-15 → 2017-05-15 · 4 obs
● 2017-05-15 08:53:50
○ 2026-04-18 01:01:38
○ 2026-07-30 12:04:38
○NSjuming.dnsdun.net2017-05-15 → 2017-05-15 · 4 obs
● 2017-05-15 08:53:50
○ 2026-04-18 01:01:38
○ 2026-07-30 12:04:38
○NSns1.ename.net2026-05-22 → 2026-05-22 · 4 obs
● 2026-05-22 15:13:00
○ 2026-05-24 17:28:14
○ 2026-07-30 12:04:38
●NSns1.julydns.com2026-05-24 → 2026-07-30 · 3 obs
● 2026-05-24 17:28:14
● 2026-07-30 12:04:38
●NSns1.onclouddns.com2026-05-24 → 2026-07-30 · 3 obs
● 2026-05-24 17:28:14
● 2026-07-30 12:04:38
○NSns2.ename.net2026-05-22 → 2026-05-22 · 4 obs
● 2026-05-22 15:13:00
○ 2026-05-24 17:28:14
○ 2026-07-30 12:04:38
●NSns2.julydns.com2026-05-24 → 2026-07-30 · 3 obs
● 2026-05-24 17:28:14
● 2026-07-30 12:04:38
●NSns2.onclouddns.com2026-05-24 → 2026-07-30 · 3 obs
● 2026-05-24 17:28:14
● 2026-07-30 12:04:38
○NSns6.dnsdun.com2016-11-26 → 2016-11-26 · 4 obs
● 2016-11-26 03:25:06
○ 2017-05-15 08:53:50
○ 2026-07-30 12:04:38
○NSns6.dnsdun.net2016-11-26 → 2016-11-26 · 4 obs
● 2016-11-26 03:25:06
○ 2017-05-15 08:53:50
○ 2026-07-30 12:04:38
○NSwww.51cnedu.com2015-06-15 → 2016-04-01 · 4 obs
● 2016-04-01 08:12:22
○ 2016-11-26 03:25:06
○ 2026-07-30 12:04:38
○MXio.bouncemx.com2015-10-28 → 2016-04-01 · 4 obs
● 2016-04-01 08:12:22
○ 2016-11-26 03:25:06
○ 2026-07-30 12:04:38
○A124.156.114.762026-05-26 → 2026-07-19 · 7 obs
● 2026-05-26 06:50:18
● 2026-06-06 17:05:38
○ 2026-06-08 09:11:30
● 2026-07-19 19:19:40
○ 2026-07-26 16:59:36
○ 2026-07-30 12:04:38
○A148.163.53.2222016-11-26 → 2016-11-26 · 4 obs
● 2016-11-26 03:25:06
○ 2017-05-15 08:53:50
○ 2026-07-30 12:04:38
○A173.242.120.2372026-07-26 → 2026-07-26 · 4 obs
● 2026-07-26 16:59:36
○ 2026-07-27 18:16:44
○ 2026-07-30 12:04:38
○A199.193.125.582026-06-08 → 2026-06-08 · 4 obs
● 2026-06-08 09:11:30
○ 2026-07-19 19:19:40
○ 2026-07-30 12:04:38
○A38.55.102.2032026-07-27 → 2026-07-27 · 4 obs
● 2026-07-27 18:16:44
○ 2026-07-30 09:38:48
○ 2026-07-30 12:04:38
●A38.55.102.2052026-07-30 → 2026-07-30 · 3 obs
● 2026-07-30 09:38:48
● 2026-07-30 12:04:38
○A70.39.84.2432016-04-01 → 2016-04-01 · 4 obs
● 2016-04-01 08:12:22
○ 2016-11-26 03:25:06
○ 2026-07-30 12:04:38
○A70.39.84.2472015-06-15 → 2015-06-15 · 3 obs
○ 2017-05-15 08:53:50
○ 2026-07-30 12:04:38
○A70.39.84.2512015-10-28 → 2016-01-15 · 5 obs
● 2015-10-28 00:54:20
● 2016-01-15 01:23:30
○ 2016-04-01 08:12:22
○ 2026-07-30 12:04:38
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | j.gtld-servers.net, l.gtld-servers.net, k.gtld-servers.net, f.gtld-servers.net... | - |
| 51cnedu.com | ns1.onclouddns.com, ns2.onclouddns.com | 2 records |
✅ Authoritative Response
Server:162.159.27.251
NS records: ns1.onclouddns.com, ns2.onclouddns.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 51cnedu.com (unsigned zone)
⏱️ Timing
Total: 251ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 38.55.102.205 |
| NS | 2 | ns1.julydns.com, ns2.julydns.com |
| SOA | 1 | ns1.julydns.com master.jmdns.com |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns1.onclouddns.com, ns2.onclouddns.com)
Analysis
Hierarchy
51cnedu.com serves as the parent of mail.51cnedu.com.
IP Addresses
51cnedu.com has exactly one IP address — 38.55.102.205.
025design.com, 65yt.com, zqgcbj.com plus two other host names have IP numbers in common with 51cnedu.com.
Name Servers
Four name servers handle the delegation for 51cnedu.com: ns1.julydns.com, ns2.julydns.com, ns1.onclouddns.com and ns2.onclouddns.com.
51cnedu.com has at least partial name server overlap with other domains, such as hdlhq.com, gryjv.cn, bhmap100.com and two others.
It is common to see these name servers used together with name servers ns1.judns.com and ns2.judns.com.
ns1.julydns.com and ns2.julydns.com share the IP address 162.159.48.223; ns1.onclouddns.com and ns2.onclouddns.com share the IP address 162.159.27.251.
The host names ns1.julydns.com and ns2.julydns.com both resolve to 162.159.48.223 IP addresses.
The host names ns1.onclouddns.com and ns2.onclouddns.com both resolve to 162.159.27.251 IP addresses.