203.151.0.0/19

Currently announced by AS4618 Internet Thailand (INET), in the routed prefix 203.151.0.0/19.

Current ASN: AS4618; Internet Thailand (INET)
Routed prefix: 203.151.0.0/19; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: APNIC; Thailand · 203.151.0.0/17

Routing data · Oct 23, 2026, 20:21 UTC

ASN historyEvery routed prefix covering 203.151.0.0/19

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
203.151.0.0/19	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.0.0/16	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing

More specific routes18 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
203.151.0.0/20	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.0.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.1.0/24	AS133529	Land and Houses Bank Public Company Limited	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.3.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.4.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.6.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.10.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.11.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.15.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.16.0/20	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.18.0/24	AS23644	Government Savings Bank	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.19.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.20.0/23	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.22.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.23.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.25.0/24	AS38184	Thaivivat Insurance	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.26.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	Announcing
203.151.27.0/24	AS4618	Internet Thailand (INET)	Thailand	Before monitoring	2026-10-23 20:21	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: 203.151.0.0/17
Country: Thailand
Allocation date: 1996-06-12
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.