17zhihu.com - robtex.com
17zhihu.com
| CNAME | jmtdexs3.luvipcdn.cn | ||||||
| CNAME | mq8tuxdn.luvipcdn.cn | ||||||
| DNSSEC | ⚠️ Not signed | ||||||
| A | 51.81.135.248🇺🇸 OVH51.81.128.0/17 Hosting route | ||||||
| PTR | ip248.ip-51-81-135.us | ||||||
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=1774839912 | ||||||
Same first word
17zhihu.com |
DNS History
7 records (3 active, 4 former)
○NSdns.4cun.com2017-05-12 → 2017-05-12 · 3 obs
● 2017-05-12 02:42:46
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
●NSns1.julydns.com2026-03-27 → 2026-03-30 · 3 obs
○ 2017-05-12 02:42:46
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
●NSns2.julydns.com2026-03-27 → 2026-03-30 · 3 obs
○ 2017-05-12 02:42:46
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
○A125.88.190.512017-05-12 → 2017-05-12 · 3 obs
● 2017-05-12 02:42:46
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
○CNAMEa1cb36dbbf9a244349b89c19227b7395.360safedns.com2017-05-12 → 2017-05-12 · 3 obs
● 2017-05-12 02:42:46
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
●CNAMEjmtdexs3.luvipcdn.cn2026-03-27 → 2026-03-30 · 3 obs
○ 2017-05-12 02:42:46
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
● 2026-03-27 04:06:42
● 2026-03-30 03:33:52
○CNAMEqvps45362.jeanet.com.cn2017-05-12 → 2017-05-12 · 3 obs
● 2017-05-12 02:42:46
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
○ 2026-03-27 04:06:42
○ 2026-03-30 03:33:52
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net... | - |
| 17zhihu.com | ns1.julydns.com, ns2.julydns.com | 2 records |
✅ Authoritative Response
Server:162.159.48.223
NS records: ns1.julydns.com, ns2.julydns.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 17zhihu.com (unsigned zone)
⏱️ Timing
Total: 360ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 2 | ns1.julydns.com, ns2.julydns.com |
| CNAME | 1 | jmtdexs3.luvipcdn.cn |
| SOA | 1 | ns1.julydns.com master.jmdns.com |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns1.julydns.com, ns2.julydns.com)
Analysis
IP Addresses
17zhihu.com points to a single IP number: 51.81.135.248.
Other host names, for instance ip248.ip-51-81-135.us and mydanhao.com, share IP numbers with 17zhihu.com.