iopt.cn - robtex.com

iopt.cn

DNSSEC⚠️ Not signed
A221.231.138.103🇨🇳 CHINATELECOM-JIANGSU-NANJING-IDC221.231.136.0/21 CTJS NJ-IDC
NSdns7.4cun.com ⭐
A2408:4005:3dc:af00:a6be:339e:a1a0:d2b8🇨🇳 Alibaba-Cloud2408:4005::/33
A61.172.183.74🇨🇳 SHANGHAITELECOM61.172.182.0/23 SHIDC
NSdns.4cun.com ⚠️ Not in zone NS records
NSdns8.51dns.top ⚠️ Not in zone NS records
A2408:4005:3dc:af00:a6be:339e:a1a0:d2b8🇨🇳 Alibaba-Cloud2408:4005::/33
A219.138.102.210🇨🇳 CHINATELECOM-HUBEI-YICHANG-IDC219.138.102.0/24 yichang
SOAdns.4cun.comadmin@iopt.cn serial=1776073177

cn

DNSSEC🔒 Signed (DS record present)
NSa.dns.cn ⭐
NSb.dns.cn
NSc.dns.cn
NSd.dns.cn
NSe.dns.cn
NSns.cernet.net ⚠️ Not in parent delegation
SOAa.dns.cnroot@cnnic.cn 2035-04-25 #41

Same first word

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iopt.cn

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DNS History

4 records (4 active, 0 former)

NSdns.4cun.comdns7.4cun.comdns8.51dns.topA221.231.138.103
●NSdns.4cun.com2026-05-29 → 2026-07-15 · 5 obs
● 2026-05-29 19:20:58
● 2026-06-14 03:42:42
○ 2026-07-13 03:13:28
● 2026-07-15 07:40:08
● 2026-07-15 07:40:10
●NSdns7.4cun.com2026-05-29 → 2026-07-15 · 2 obs
● 2026-05-29 19:20:58
● 2026-07-15 07:40:10
●NSdns8.51dns.top2026-05-29 → 2026-07-15 · 2 obs
● 2026-05-29 19:20:58
● 2026-07-15 07:40:10
●A221.231.138.1032026-05-29 → 2026-07-15 · 5 obs
● 2026-05-29 19:20:58
● 2026-06-14 03:42:42
○ 2026-07-13 03:13:28
● 2026-07-15 07:40:08
● 2026-07-15 07:40:10

🔍 DNS Trace

Analysis

IP Addresses

iopt.cn resolves to one IP address: 221.231.138.103.

szdoit.com, shgniu.com, feirun.cn and two other host names share IP numbers with iopt.cn.

Name Servers

The authoritative name servers for iopt.cn are dns7.4cun.com, dns.4cun.com and dns8.51dns.top — three in total.

There is at least partial name server overlap between iopt.cn and other domains — rita-led.com, cdhcl.com, fjocean.com and two more among them.

These name servers regularly appear alongside dns4.51dns.top, dns3.4cun.com, dns8.4cun.com and 6 other name servers in NS record sets.

The two hostnames dns7.4cun.com and dns8.51dns.top each carry two IP addresses — dns7.4cun.com resolves to 61.172.183.74 and 2408:4005:3dc:af00:a6be:339e:a1a0:d2b8, and dns8.51dns.top resolves to 219.138.102.210 and 2408:4005:3dc:af00:a6be:339e:a1a0:d2b8, with 2408:4005:3dc:af00:a6be:339e:a1a0:d2b8 common to both.

Both dns7.4cun.com and dns8.51dns.top resolve to 2408:4005:3dc:af00:a6be:339e:a1a0:d2b8 IP addresses each.