Autonomous system
AS4015 CENTURYLINK-LEGACY-QWEST-SPA-OMAHA - CenturyLink Communications, LLC
Unclassified ARIN
Summary
CenturyLink Communications (legacy Qwest)
transit legacy
CENTURYLINK-LEGACY-QWEST-SPA-OMAHA is held by CenturyLink Communications, LLC, now part of Lumen Technologies. The handle marks it as one of the Qwest autonomous systems CenturyLink inherited when it acquired Qwest in 2011.
What it's used for
- Carrying customer and infrastructure address space in Lumen's network, keyed to the Omaha region that Qwest historically served.
- It is one of a whole family of
CENTURYLINK-LEGACY-QWEST-*ASNs kept alive after the merger rather than renumbered into the parent network.
Notable
- The announced prefixes are legacy blocks (including space in
155.70.0.0/16) that predate the CenturyLink era, which is why the ASN name still carries the Qwest lineage two corporate owners later. - Omaha was Qwest's home city, and the company was itself built out of the US West regional Bell operating company.
Interesting
- Big carriers rarely retire acquired ASNs. Renumbering customers is disruptive, so the number and its name survive as a fossil record of who owned the network first.
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 |
|---|---|---|
| AS209 | CenturyLink Communications, LLC | 277 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-03, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 14.34K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 5 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4015- Registry name
- CENTURYLINK-LEGACY-QWEST-SPA-OMAHA
- Registrant
- CenturyLink Communications, LLC
- Abuse contact
- abuse@aup.lumen.com
- Registered
- 1994-11-10
- Last changed
- 2018-10-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS4015
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 5 announcements
- Route objects
- 0 naming AS4015
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: 448 networks and 1,851 prefixes, as published 2026-11-04. 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