asn.dev

Autonomous system

AS58912 CTSL-BD Chittagong Telecom Services Ltd

Unclassified APNIC

IPv4 addresses 2.05K 2 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly BD
Exchanges 2 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Chittagong Telecom Services Ltd

Bangladesh · AI-generated

isp residential business bangladesh

CTSL-BD is the AS handle for Chittagong Telecom Services Ltd.

What it's used for

  • The address space carries corporate and commercial internet services, with netnames CTSL-BD and registrants identified as Chittagong Telecom Services Limited.
  • The AS announces 2048 IPv4 addresses across 2 prefixes and 2 IPv6 prefixes, maintaining 2 observed neighbours, a ratio consistent with a regional access provider.
  • Traffic from this AS consists of subscriber and business internet access for corporate and commercial clients in Chittagong, Bangladesh.

Notable

  • Registrants for both announced prefixes align with the AS holder, listing Chittagong Telecom Services Limited as the administrator.
  • The address inventory is compact, consisting of two /22 IPv4 blocks and two /35 IPv6 blocks, all located in Bangladesh.

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

Recorded at 2 exchanges in 1 country, largest first.

ExchangeLocationTheir address
Internet Service Providers Association of BangladeshDhaka, Bangladesh103.161.217.206
Bangladesh Internet ExchangeDhaka, Bangladesh103.151.196.77

Transit providers

2 upstream, 0 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS58717Summit Communications Ltd388
AS139009Windstream Communication Limited224

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, 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 2 prefixes · 2.05K addresses IPv6 2 prefixes

CountryNamePrefixes
BDBangladesh4

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS58912
Registry name
CTSL-BD
Registrant
Chittagong Telecom Services Limited
Abuse contact
azim@ctgtel.net
Registered
2013-04-29
Last changed
2020-10-05
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 12 valid, 0 with no ROA
ROAs
19 authorising AS58912
ASPA
no ASPA record
IRR
100% registered · 12 of 12 announcements
Route objects
31 naming AS58912

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: 445 networks and 1,817 prefixes, as published 2026-10-27. 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