knowledge4u.com.cn - robtex.com
knowledge4u.com.cn
| DNSSEC | ⚠️ Not signed | ||||||
| A | 168.76.12.219🇿🇦 ASLINE-AS-AP168.76.0.0/20 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.judns.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.judns.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 | ||||||
| SOA | ns1.julydns.commaster@jmdns.com serial=1774850021 | ||||||
com.cn
| DNSSEC | ⚠️ Not signed | ||||||
| NS | a.dns.cn ⭐ ⚠️ Not in parent delegation | ||||||
| NS | b.dns.cn ⚠️ Not in parent delegation | ||||||
| NS | c.dns.cn ⚠️ Not in parent delegation | ||||||
| NS | cns.cernet.net ⚠️ Not in parent delegation | ||||||
| NS | d.dns.cn ⚠️ Not in parent delegation | ||||||
| NS | e.dns.cn ⚠️ Not in parent delegation | ||||||
| SOA | a.dns.cnroot@cnnic.cn serial=2030537638 | ||||||
Subdomains
mail.knowledge4u.com.cn |
Same first word
DNS History
9 records (5 active, 4 former)
○NSdns7.hichina.com2015-06-23 → 2018-11-14 · 4 obs
● 2018-11-14 07:03:04
○ 2026-04-05 12:39:50
○ 2026-04-27 20:32:00
○NSdns8.hichina.com2015-06-23 → 2018-11-14 · 4 obs
● 2018-11-14 07:03:04
○ 2026-04-05 12:39:50
○ 2026-04-27 20:32:00
●NSns1.judns.com2026-04-05 → 2026-04-27 · 3 obs
● 2026-04-05 12:39:50
● 2026-04-27 20:32:00
●NSns1.julydns.com2026-04-05 → 2026-04-27 · 3 obs
● 2026-04-05 12:39:50
● 2026-04-27 20:32:00
●NSns2.judns.com2026-04-05 → 2026-04-27 · 3 obs
● 2026-04-05 12:39:50
● 2026-04-27 20:32:00
●NSns2.julydns.com2026-04-05 → 2026-04-27 · 3 obs
● 2026-04-05 12:39:50
● 2026-04-27 20:32:00
○MXmail.knowledge4u.com.cn2015-06-23 → 2018-11-14 · 4 obs
● 2018-11-14 07:03:04
○ 2026-04-05 12:39:50
○ 2026-04-27 20:32:00
●A168.76.12.2192026-04-05 → 2026-04-27 · 3 obs
● 2026-04-05 12:39:50
● 2026-04-27 20:32:00
○A219.238.233.282015-06-23 → 2018-11-14 · 4 obs
● 2018-11-14 07:03:04
○ 2026-04-05 12:39:50
○ 2026-04-27 20:32:00
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cn | d.dns.cn, e.dns.cn, a.dns.cn, c.dns.cn... | - |
| knowledge4u.com.cn | ns1.judns.com, ns2.judns.com | - |
✅ Authoritative Response
Server:162.159.27.251
NS records: ns1.judns.com, ns2.judns.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for knowledge4u.com.cn (unsigned zone)
⏱️ Timing
Total: 1458ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 168.76.12.219 |
| NS | 2 | ns1.julydns.com, ns2.julydns.com |
| SOA | 1 | ns1.julydns.com master.jmdns.com |
Analysis
Hierarchy
knowledge4u.com.cn is the parent of mail.knowledge4u.com.cn.
IP Addresses
knowledge4u.com.cn resolves to one IP number: 168.76.12.219.
Other host names, for instance mail.knowledge4u.com.cn, share IP numbers with knowledge4u.com.cn.
Name Servers
knowledge4u.com.cn is delegated to four name servers: ns1.judns.com, ns2.judns.com, ns1.julydns.com and ns2.julydns.com.
knowledge4u.com.cn at least partially shares name servers with other domains, for instance 9191y.com, prjq.cn, fsgdgw.top, vlansoft.com and wh(0x666170)aoji.com.
These name servers are commonly used alongside jm1.dns.com and jm2.dns.com.
Host names with a single IP:
ns1.judns.com points to 162.159.27.251.
ns2.judns.com points to 162.159.27.251.
ns1.julydns.com points to 162.159.48.223.
ns2.julydns.com points to 162.159.48.223.
Host names pointing to 162.159.27.251: ns1.judns.com and ns2.judns.com.
Host names pointing to 162.159.48.223: ns1.julydns.com and ns2.julydns.com.