2001:c20:4800::/38

Currently announced by AS3758 SingNet, in the routed prefix 2001:c20:4800::/38.

Current ASN: AS3758; SingNet
Routed prefix: 2001:c20:4800::/38; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: APNIC; Singapore · 2001:c20::/32

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 2001:c20:4800::/38

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:c20:4800::/38	AS3758	SingNet	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20::/32	AS3758	SingNet	Singapore	Before monitoring	2026-11-08 10:26	Announcing

More specific routes37 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:c20:4849::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:485e::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:485f::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:486c::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4871::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4874::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:487e::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4884::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4887::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:488c::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:488d::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:488f::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4892::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4894::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:4895::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48a0::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48a6::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48ae::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48af::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48b0::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48b8::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48b9::/48	AS65564	—	—	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48c2::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48c4::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48c6::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48cc::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48d8::/48	AS400696	MIBURA-1	United States	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48da::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48db::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48dc::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48e6::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48e7::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48e9::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48ea::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48f0::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:48fe::/48	AS3758	SingNet	Singapore	Before monitoring	2026-11-08 10:26	Announcing
2001:c20:489a::/48	AS9255	Singapore Telecom	Singapore	Before monitoring	2026-11-03 04:47	Stopped

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: 2001:c20::/32
Country: Singapore
Allocation date: 2002-07-24
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.