Autonomous system
AS6223 CENTURYLINK-MTIPS1-STN
Unclassified ARIN
Summary
CenturyLink MTIPS (Trusted Internet Connection gateway)
government enterprise legacy
CENTURYLINK-MTIPS1-STN is one of CenturyLink's (now Lumen's) MTIPS autonomous systems — Managed Trusted Internet Protocol Service, the GSA-contract service that gives US federal agencies a compliant, monitored gateway to the public internet. Its companion is AS6224.
What it's used for
- Fronting federal civilian agencies' internet connections through a Trusted Internet Connection (TIC) portal, as required by the OMB TIC initiative and sold under the GSA Networx and EIS contracts.
- Announces a small footprint — a handful of IPv4 prefixes plus IPv6.
Notable
- Although the ASN belongs to a commercial carrier, the traffic is government: reverse DNS in the space resolves to federal
.govagency endpoints. An address here is best read as a US federal agency behind a managed security gateway, not as CenturyLink's own network. - MTIPS is a security service, so the space is intentionally small and concentrated. It is not transit, hosting or consumer broadband.
Interesting
- The number is registered to the same CenturyLink organisation as AS6222, which carries former-Embarq consumer DSL. Same holder, entirely different kind of network — a good reminder that a carrier's parent identity tells you very little about what any one of its ASNs actually does.
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, 7 downstream and 12 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS209 | CenturyLink Communications, LLC | 248 |
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
IPv4 3 prefixes · 2.56K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 5 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS6223- Registry name
- CENTURYLINK-MTIPS1-STN
- Registrant
- CenturyLink Communications, LLC
- Abuse contact
- abuse@aup.lumen.com
- Registered
- 1996-01-25
- Last changed
- 2020-10-20
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS6223
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 5 announcements
- Route objects
- 0 naming AS6223
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