121.176.0.0/12

Currently announced by AS4766 KT Corporation (Korea Telecom), in the routed prefix 121.176.0.0/12.

Current ASN: AS4766; KT Corporation (Korea Telecom)
Routed prefix: 121.176.0.0/12; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: APNIC; South Korea · 121.160.0.0/11

Routing data · Nov 8, 2026, 12:23 UTC

ASN historyEvery routed prefix covering 121.176.0.0/12

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
121.176.0.0/12	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.0.0/11	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing

More specific routes43 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
121.176.0.0/13	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.176.133.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.176.134.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.177.31.0/24	AS38427	FORCETEC Co., LTD.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.178.209.0/24	AS38681	Jeollanamdo Educational Research Information Institute	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.181.196.0/24	AS38696	Korea Brain Research Institute	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.0.0/13	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.184.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.185.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.186.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.187.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.188.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.189.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.192.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.193.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.194.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.195.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.196.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.197.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.198.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.199.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.200.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.184.201.0/24	AS38105	SOON CHUN HYANG UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.185.13.0/24	AS18169	MEMC Korea	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.186.148.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.187.23.0/24	AS55615	DOUZONEBIZON	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.187.64.0/20	AS17862	Kangwon National University	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.187.80.0/22	AS17862	Kangwon National University	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.187.84.0/23	AS17862	Kangwon National University	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.189.167.0/24	AS55622	CNUE	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.189.168.0/22	AS55622	CNUE	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.174.0/24	AS3786	LG Uplus	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.174.0/24	AS23591	LS ITC	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.208.0/24	AS45399	Hanjin Information Systems Telecommunication Co., Ltd	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.209.0/24	AS45399	Hanjin Information Systems Telecommunication Co., Ltd	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.250.0/24	AS38391	Gyeonggi provincial gimpo office of education	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.190.251.0/24	AS38404	Gyeonggi Provincial Bucheon Office of Education	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.149.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.150.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.151.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.152.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.166.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.191.190.0/24	AS9707	Korea Employment Information Management Agency	South Korea	Before monitoring	2026-11-08 12:23	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

Look up another address

RIR allocation record

Registry: APNIC
Allocated block: 121.160.0.0/11
Country: South Korea
Allocation date: 2006-11-01
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.