202.28.128.0/20

Currently announced by AS4762 Mahidol University, Thailand, in the routed prefix 202.28.128.0/20.

Current ASN: AS4762; Mahidol University, Thailand
Routed prefix: 202.28.128.0/20; Most specific route covering this prefix
ASNs over time: 2; 3 announcement records
RIR allocation: APNIC; Thailand · 202.28.128.0/20

Routing data · Nov 1, 2026, 22:23 UTC

ASN historyEvery routed prefix covering 202.28.128.0/20

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
202.28.128.0/20	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.128.0/18	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.0.0/15	AS4621	UniNet Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing

More specific routes18 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
202.28.128.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.129.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.130.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.131.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.132.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.133.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.134.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.135.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.136.0/22	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.136.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.137.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.138.0/23	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.138.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.139.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.140.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.141.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.142.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	Announcing
202.28.143.0/24	AS4762	Mahidol University, Thailand	Thailand	Before monitoring	2026-11-01 22:23	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: 202.28.128.0/20
Country: Thailand
Allocation date: 1993-10-14
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.