asn.dev

Autonomous system

AS28387 Computadoras y Servicios Especiales SA de CV

Unclassified LACNIC

IPv4 addresses 4.10K 3 prefixes
IPv6 prefixes 20 counted as prefixes, not addresses
Countries 1 mostly MX
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Blacom

Mexico · AI-generated

isp residential mexico cable

AS28387 is operated by Blacom (Computadoras y Servicios Especiales SA de CV).

What it's used for

  • The address space carries residential and business access traffic, evidenced by reverse DNS entries pointing to blacom.net (e.g., 201-139-181-254.blacom.net).
  • The AS announces 4,096 IPv4 addresses across 3 prefixes and 20 IPv6 prefixes, while maintaining only 2 observed routing neighbours. This high address-to-neighbour ratio indicates a regional access provider rather than a transit carrier.

Notable

  • Registrants for the largest prefixes are split between Telecomunicaciones Autónomas Sin Límite, S.A. de C.V. (for 201.139.176.0/21 and 45.174.84.0/22) and the AS holder Computadoras y Servicios Especiales SA de CV (for 201.131.200.0/22).
  • The inventory consists of a mix of legacy 201.x space and newer 45.x allocations, all concentrated in Mexico.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS32098Transtelco Inc925
AS1299Arelion Sweden AB337

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 3 prefixes · 4.10K addresses IPv6 20 prefixes

CountryNamePrefixes
MXMexico23

Registry

Allocation record

LACNIC · via Atlas (registry + RDAP)
Registry
LACNIC
Handle
AS28387
Registry name
28387
Registrant
Computadoras y Servicios Especiales SA de CV
Abuse contact
admin@blacom.com.mx
Registered
2013-02-25
Last changed
2013-02-25
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 23 valid, 0 with no ROA
ROAs
5 authorising AS28387
ASPA
no ASPA record
IRR
100% registered · 23 of 23 announcements
Route objects
20 naming AS28387

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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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

Cross-check