Autonomous system
AS11623 CTCN
Residential APNIC
Summary
CT Communications Network
isp legacy
CTCN is CT Communications Network — the internet arm of CT Comm of Urbana, Ohio, the local telephone company for Champaign County, which traces its origins to the Champaign County Telephone Company. It is a small independent ILEC selling internet, phone and TV in its home territory.
What it's used for
Last-mile broadband and the operator's own backbone. The reverse DNS names the access technology directly and is the clearest evidence in the pack: 65-75-224-5.dsl.ctcn.net and 67-43-200-5.dsl.ctcn.net are DSL subscriber addresses; 67-43-192-5.backbone.ctcn.net is the operator's own core; and 65-75-232-5.unused.ctcn.net is a block the operator has explicitly labelled as unassigned. A provider that tags its own pools dsl, backbone and unused in its own domain is running an access network on its own space, and there is no ambiguity about what the addresses carry.
Notable
RIS sees 3 announced v4 prefixes carrying 8,192 addresses, one IPv6 prefix (2607:8540::/32), and one observed BGP neighbour. The single upstream is the role signal: this is a customer edge that buys transit, not a carrier. All three v4 prefixes — 65.75.224.0/20, 67.43.192.0/20 and a /24 carved from the latter — are registered to CTCNETWORK (org: CT Communications Network), so the space is entirely self-held.
Interesting
The /32 of IPv6 is an ISP-sized allocation, sized for delegating prefixes to subscribers, and it is announced — a small rural telco with production v6 while much larger networks in this sweep announce none at all.
The name invites a wrong guess: CTCN and "CT Communications" read as Connecticut. The address record puts it in Ohio.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7106 | Com Net, Inc. | 232 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 8.19K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 3 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS11623- Registry name
- CTCN
- Registrant
- CT Communications Network
- Abuse contact
- engineering@ctcommunications.com
- Registered
- 1998-10-26
- Last changed
- 2019-04-03
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 25% valid · 1 valid, 3 with no ROA
- ROAs
- 1 authorising AS11623
- ASPA
- no ASPA record
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 6 naming AS11623
Reputation
Classification and threat
Residential Fixed-line consumer ISP. Addresses here are homes.
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: 442 networks and 1,779 prefixes, as published 2026-10-22. 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