Autonomous system
AS11172 Alestra, S. de R.L. de C.V.
Unclassified RIPE
Summary
Alestra, S. de R.L. de C.V.
isp enterprise transit legacy
AS11172 is Alestra, one of Mexico's major business telecommunications carriers. Alestra began as a joint venture built around AT&T's entry into the Mexican long-distance market and has since sat inside the Alfa/Axtel group; its market is corporate connectivity, managed networks, data centre and IT services, not consumer broadband.
What it's used for
Carrying a national enterprise network. RIS sees a genuinely large footprint: 924 announced IPv4 prefixes / 603,136 addresses, roughly 2,858 IPv6 prefixes, and 110 observed neighbours. The neighbour count is what places it — dozens of BGP adjacencies means it is selling connectivity and interconnecting with other carriers, while an enterprise of any size would peer with a handful.
Notable
Reverse DNS is uniform and first-party: sampled addresses across 189.206.0.0/16, 148.244.0.0/16, 201.163.0.0/16 and 201.151.0.0/16 all answer as static-<a>-<b>-<c>-<d>.alestra.net.mx. Two things follow. First, holder, address space and rDNS all agree, so this is a real operator's own inventory rather than announced third-party space. Second, the static- convention across the bulk of the space is consistent with fixed assignments to business sites, which matches Alestra's B2B positioning better than any dynamic consumer pool would.
Interesting
The very high IPv6 prefix count relative to IPv4 (thousands of /48s) is the fingerprint of per-customer IPv6 delegation: each corporate site gets its own /48, and many of them end up visible in the global table individually.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| MEX-IX McAllen | McAllen, United States | 206.71.142.27 |
| NIX Monterrey | Monterrey, Mexico | 45.68.68.19 |
Transit providers
9 upstream, 106 downstream and 139 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 541 prefixes · 597K addresses IPv6 3,035 prefixes
| Country | Name | Prefixes |
|---|---|---|
| MX | Mexico | 3,576 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS11172- Registry name
- 11172
- Registrant
- Alestra, S. de R.L. de C.V.
- Abuse contact
- admcapacidadipaxtel@axtel.com.mx
- Registered
- 1998-05-05
- Last changed
- 2004-07-23
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 99.2% valid · 3,999 valid, 31 with no ROA
- ROAs
- 40 authorising AS11172
- ASPA
- no ASPA record
- IRR
- 99.8% registered · 4,022 of 4,030 announcements 8 other origin
- Route objects
- 1,275 naming AS11172
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,771 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere