121.160.0.0/12

Currently announced by AS4766 KT Corporation (Korea Telecom), in the routed prefix 121.160.0.0/12.

Current ASN: AS4766; KT Corporation (Korea Telecom)
Routed prefix: 121.160.0.0/12; 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 121.160.0.0/12

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
121.160.0.0/12	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 routes35 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
121.160.0.0/13	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.57.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.59.0/24	AS9968	KYOBO Life Insurance Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.64.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.65.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.66.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.67.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.160.71.0/24	AS9647	Seoul Metropolitan Government	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.162.108.0/24	AS9843	NHINFORMATIONSYSTEM	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.162.123.0/24	AS38089	kbank	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.162.154.0/24	AS17859	NICEINFOMATIONSERVICE	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.162.155.0/24	AS17859	NICEINFOMATIONSERVICE	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.163.173.0/24	AS38431	KB Insurance	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.163.175.0/24	AS38431	KB Insurance	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.163.204.0/24	AS38415	Guri Namyangju Office Of Education	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.163.255.0/24	AS38392	KYONGGI YANGPYEONG OFFICE OF EDUCATION	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.164.116.0/24	AS9778	DAEJIN UNIVERSITY	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.168.0.0/13	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.168.9.0/24	AS9684	HANWHA Corp. Information Service div.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.168.251.0/24	AS23582	Doosan Corporation Digital Innovation	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.168.252.0/22	AS23582	Doosan Corporation Digital Innovation	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.169.210.0/24	AS10167	HANVIT BANK	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.142.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.147.0/24	AS55592	Korea Data Telecommunication Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.176.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.177.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.178.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.179.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.170.204.0/24	AS45382	EhostICT	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.171.150.0/24	AS9530	SHINSEGAE I C Co., Ltd.	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.172.60.0/24	AS9699	Standard Chartered	South Korea	2026-11-02 06:26	2026-11-08 12:23	Announcing
121.172.146.0/24	AS38093	HANATI	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.174.50.0/24	AS9708	Pukyong National University	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.174.96.0/24	AS9708	Pukyong National University	South Korea	Before monitoring	2026-11-08 12:23	Announcing
121.175.28.0/24	AS38087	BUSANBANK	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.

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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.