Autonomous system
AS13742 CENCOM-NEBR - CENCOM INC
Unclassified ARIN
Summary
CENCOM
isp telecom business
The netname joins two sets of initials and the reverse names use only the second.
What it's used for
- A cable and internet provider. 8,192 addresses in the single IPv4 prefix
70.37.192.0/19, two observed BGP neighbours, and no IPv6 announced.
Notable
- The AS handle is
CENCOM-NEBR, the company plus an abbreviated state. - The block is netname
NNTC-CENCOM, joining a second set of initials in front of the company's own. - The one address that answered reads
70-37-215-254.nntc.net, under the other set of initials. - The hostname hyphenates the address in forward order.
- First seen in the routing archive on 2001-04-25, an actual date rather than the archive's start.
- Three addresses were queried for reverse DNS and one returned a name.
Interesting
- A /19 announced whole, with no smaller pieces alongside it, is unusual in this range. Eight thousand addresses in a single route means nothing has ever been carved off for a customer or a second site and left announced separately.
- The registry keeps one name and the DNS keeps the other, so a reader following the address arrives at a different brand depending on which system they ask. Joining both in the netname is the only place the two are connected.
- Two neighbours for a network of this size is enough to survive one of them failing and no more, which is the usual shape for a cable operator with a single serving area.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 8.19K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS13742- Registry name
- CENCOM-NEBR
- Registrant
- CENCOM INC
- Abuse contact
- cliff.woodbury@nntcemployee.com
- Registered
- 2008-12-29
- Last changed
- 2025-11-21
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 2 valid, 0 with no ROA
- ROAs
- 2 authorising AS13742
- ASPA
- no ASPA record
- IRR
- 100% registered · 2 of 2 announcements
- Route objects
- 2 naming AS13742
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: 453 networks and 1,846 prefixes, as published 2026-11-11. 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