`ossc-bjtu.cn`

DNSSEC	⚠️ Not signed
A	140.188.196.80^{🇺🇸 PEGTECHINC140.188.192.0/19 PEG TECH INC}
NS	`ns1.nowcndns.com` ⭐
		A	1.193.216.204^{🇨🇳 CHINANET-Henan-Luoyang-IDC1.193.216.0/24 Chinatelecom HeNan Province Network}
		A	218.98.111.129^{🇩🇪 HKCICL-AS-AP218.98.111.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	218.98.111.138^{🇩🇪 HKCICL-AS-AP218.98.111.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
NS	`ns2.nowcndns.com`
		A	61.158.128.11^{🇨🇳 CHINA169-Backbone61.158.128.0/17 CNC Group CHINA169 Henan Province Network}
			PTR	`11.128.158.61.ha.cnc`
		A	183.253.57.202^{🇨🇳 CHINAMOBILE-CN183.253.0.0/16 CMI (Customer Route)}
		A	211.99.99.38^{🇨🇳 DONGGUAN-1211.99.99.0/24 Proxy-registered route object}
SOA	`ns1.nowcndns.com`admin@nowcndns.com serial=1778891323

`cn`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.dns.cn` ⭐
	NS	`b.dns.cn`
	NS	`c.dns.cn`
	NS	`d.dns.cn`
	NS	`e.dns.cn`
	NS	`ns.cernet.net` ⚠️ Not in parent delegation
	SOA	`a.dns.cn`root@cnnic.cn serial=2034926275

Subdomains

www.ossc-bjtu.cn

Same first word

ossc-bjtu.cn

DNS History

4 records (3 active, 1 former)

●NSns1.nowcndns.com2026-02-18 → 2026-06-16 · 2 obs

● 2026-02-18 04:25:36
● 2026-06-16 23:31:24

●NSns2.nowcndns.com2026-02-18 → 2026-06-16 · 2 obs

● 2026-02-18 04:25:36
● 2026-06-16 23:31:24

○A108.186.232.482026-02-18 → 2026-05-05 · 4 obs

● 2026-02-18 04:25:36
● 2026-05-05 06:27:54
○ 2026-05-08 04:53:50
○ 2026-06-16 23:31:24

●A140.188.196.802026-05-08 → 2026-06-16 · 3 obs

○ 2026-05-05 06:27:54
● 2026-05-08 04:53:50
● 2026-06-16 23:31:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cn	b.dns.cn, a.dns.cn, e.dns.cn, c.dns.cn...	-
ossc-bjtu.cn	ns1.nowcndns.com, ns2.nowcndns.com	-

✅ Authoritative Response

Server:61.158.128.11

NS records: ns1.nowcndns.com, ns2.nowcndns.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ossc-bjtu.cn (unsigned zone)

⏱️ Timing

Total: 1145ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`140.188.196.80`
NS	2	`ns1.nowcndns.com, ns2.nowcndns.com`
SOA	1	`ns1.nowcndns.com admin.nowcndns.com`

Analysis

Hierarchy

The domain www.ossc-bjtu.cn falls under the parent ossc-bjtu.cn.

IP Addresses

ossc-bjtu.cn has exactly one IP address — 140.188.196.80.

Other host names, among them www.ossc-bjtu.cn and xisx.cn, have IP numbers in common with ossc-bjtu.cn.

Name Servers

ossc-bjtu.cn is served by two delegated name servers, ns1.nowcndns.com and ns2.nowcndns.com.

The name server configuration of ossc-bjtu.cn is shared with other domains, for instance cyvg.cn, yijiagangmu.cn, sensornet.cn and two others.

The hosts ns1.nowcndns.com and ns2.nowcndns.com both resolve to three IP numbers: ns1.nowcndns.com to 1.193.216.204, 218.98.111.129 and 218.98.111.138, and ns2.nowcndns.com to 61.158.128.11, 183.253.57.202 and 211.99.99.38.

ossc-bjtu.cn - robtex.com

ossc-bjtu.cn

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