210.104.0.0/16

Currently announced by AS4766 KT Corporation (Korea Telecom), in the routed prefix 210.104.0.0/16.

Current ASN: AS4766; KT Corporation (Korea Telecom)
Routed prefix: 210.104.0.0/16; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: APNIC; South Korea · 210.104.0.0/15

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 210.104.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
210.104.0.0/16	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing

More specific routes46 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
210.104.8.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.9.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.10.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.11.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.12.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.13.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.14.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.15.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.20.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.21.0/24	AS9683	Seoul Facilities Corporation	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.22.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.24.0/24	AS131846	GYEONGGI-DO FIRE SERVICES	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.26.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.27.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.28.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.32.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.33.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.34.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.39.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.41.0/24	AS17841	NATIONAL INFORMATION RESOURCES SERVICE	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.44.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.48.0/20	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.57.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.58.0/23	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.80.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.102.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.103.0/24	AS9647	Seoul Metropolitan Government	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.112.0/24	AS55633	pundang jesaeng general hospital	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.123.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.126.0/24	AS9647	Seoul Metropolitan Government	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.128.0/24	AS9647	Seoul Metropolitan Government	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.129.0/24	AS9647	Seoul Metropolitan Government	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.132.0/24	AS10170	The Bank of Korea	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.133.0/24	AS10170	The Bank of Korea	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.138.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.140.0/24	AS17841	NATIONAL INFORMATION RESOURCES SERVICE	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.148.0/24	AS17841	NATIONAL INFORMATION RESOURCES SERVICE	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.156.0/24	AS131870	KSPO	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.157.0/24	AS131870	KSPO	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.158.0/24	AS131870	KSPO	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.203.0/24	AS17584	Inchon Metropolitan Office Of Education	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.218.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.237.0/24	AS45400	Korea Telecom	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.239.0/24	AS4766	KT Corporation (Korea Telecom)	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.249.0/24	AS17841	NATIONAL INFORMATION RESOURCES SERVICE	South Korea	Before monitoring	2026-11-08 10:26	Announcing
210.104.250.0/24	AS17841	NATIONAL INFORMATION RESOURCES SERVICE	South Korea	Before monitoring	2026-11-08 10:26	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: 210.104.0.0/15
Country: South Korea
Allocation date: 1997-08-29
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.