`51optical.com`

DNSSEC	⚠️ Not signed
A	192.186.36.99^{🇺🇸 AS395776192.186.36.0/24 SKBroadband customer route}
NS	`ns1.dns.com` ⭐
		A	2001:df2:f080:2::1:1^{🇭🇰 HKCICL-AS-AP2001:df2:f080::/48 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	154.23.191.128^{🇺🇸 HKCICL-AS-AP154.23.191.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	154.86.21.128^{🇭🇰 HKCICL-AS-AP154.86.21.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
NS	`ns2.dns.com`
		A	2001:df2:f080:2::1:2^{🇭🇰 HKCICL-AS-AP2001:df2:f080::/48 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	154.23.191.129^{🇺🇸 HKCICL-AS-AP154.23.191.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
		A	154.86.21.129^{🇭🇰 HKCICL-AS-AP154.86.21.0/24 HONG KONG COMMUNICATIONS INTERNATIONAL CO.,LIMITED}
SOA	`ns1.dns.com`admin@dns.com serial=1768525180

`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.net`nstld@verisign-grs.com serial=1774916757

Same first word

51optical.com

DNS History

6 records (3 active, 3 former)

○NSdns10.hichina.com2016-02-02 → 2017-04-20 · 4 obs

● 2016-02-02 00:24:20
● 2017-04-20 23:37:04
○ 2026-02-26 04:04:16
○ 2026-03-31 00:46:48

○NSdns9.hichina.com2016-02-02 → 2017-04-20 · 4 obs

● 2016-02-02 00:24:20
● 2017-04-20 23:37:04
○ 2026-02-26 04:04:16
○ 2026-03-31 00:46:48

●NSns1.dns.com2026-02-26 → 2026-03-31 · 3 obs

○ 2017-04-20 23:37:04
● 2026-02-26 04:04:16
● 2026-03-31 00:46:48

●NSns2.dns.com2026-02-26 → 2026-03-31 · 3 obs

○ 2017-04-20 23:37:04
● 2026-02-26 04:04:16
● 2026-03-31 00:46:48

●A192.186.36.992026-02-26 → 2026-03-31 · 3 obs

○ 2015-10-25 07:54:38
● 2026-02-26 04:04:16
● 2026-03-31 00:46:48

○A23.27.192.1152015-06-10 → 2015-06-10 · 3 obs

● 2015-06-10 12:05:34
○ 2015-10-25 07:54:38
○ 2026-03-31 00:46:48

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, k.gtld-servers.net, g.gtld-servers.net, b.gtld-servers.net...	-
51optical.com	ns1.dns.com, ns2.dns.com	6 records

✅ Authoritative Response

Server:154.23.191.129

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 51optical.com (unsigned zone)

⏱️ Timing

Total: 223ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`192.186.36.99`
NS	2	`ns1.dns.com, ns2.dns.com`
SOA	1	`ns1.dns.com admin.dns.com`

📌 Glue Records Collected

Total: 6

Out-of-bailiwick: 6 (ns1.dns.com, ns1.dns.com, ns1.dns.com...)

Analysis

IP Addresses

51optical.com resolves to one IP number: 192.186.36.99.

Other host names, for instance txmiaomu.com, qxcq180.com, china-jiuxin.com, 365slep.com and china-qdf.com share IP numbers with 51optical.com.

Name Servers

51optical.com's delegation uses two name servers: ns1.dns.com and ns2.dns.com.

51optical.com uses the same name server setup as other domains, such as 27748.cn, bctp.cn, zqzy-edu.com, 119979.com and 660911.com.

Host names with three IP numbers:

The host name ns1.dns.com resolves to 2001:df2:f080:2::1:1, 154.23.191.128 and 154.86.21.128.

The host name ns2.dns.com resolves to 2001:df2:f080:2::1:2, 154.23.191.129 and 154.86.21.129.

51optical.com - robtex.com

51optical.com

com