2001:1248:4ac0::/42

Currently announced by AS11172 Alestra, in the routed prefix 2001:1248:4ac0::/42.

Current ASN: AS11172; Alestra
Routed prefix: 2001:1248:4ac0::/42; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: LACNIC; Mexico · 2001:1248::/32

Routing data · Nov 2, 2026, 00:27 UTC

ASN historyEvery routed prefix covering 2001:1248:4ac0::/42

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:1248:4ac0::/42	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing

More specific routes21 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:1248:4ad2::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4ae4::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4ae7::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4aec::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4aed::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4aee::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4aef::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af0::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af1::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af2::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af3::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af4::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af5::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af6::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af7::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4af9::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4afa::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4afc::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4afd::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4afe::/48	AS11172	Alestra	Mexico	Before monitoring	2026-11-02 00:27	Announcing
2001:1248:4afb::/48	AS11172	Alestra	Mexico	Before monitoring	2026-10-30 20:21	Stopped

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: LACNIC
Allocated block: 2001:1248::/32
Country: Mexico
Allocation date: 2008-01-08
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.