Autonomous system
AS22561 CENTURYLINK-LEGACY-LIGHTCORE
Unclassified ARIN
Summary
CenturyLink (LightCore)
residential isp legacy us
CENTURYLINK-LEGACY-LIGHTCORE is operated by CenturyLink Communications, LLC.
What it's used for
- The address space carries residential and business access traffic, evidenced by reverse DNS records pointing to
dyn.centurytel.netand netnames such asCENTURYLINK-LEGACY-CENTURYTEL-NETBLOCK11. - The AS announces 1,211,904 IPv4 addresses across 429 prefixes, while maintaining only 14 observed neighbours, a ratio indicative of an access network rather than a transit provider.
Notable
- All sampled registrants are listed as CenturyLink Communications, LLC, consistent with the AS holder.
- CenturyLink merged with Lumen Technologies in 2020, after which the company was renamed Lumen Technologies, Inc., though this AS retains the legacy CenturyLink/LightCore designation.
- The inventory consists of 429 IPv4 prefixes with no IPv6 prefixes announced, reflecting a legacy IPv4-centric estate.
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, 12 downstream and 13 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS209 | CenturyLink Communications, LLC | 19,660 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-30, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 397 prefixes · 1.23M addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 397 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS22561- Registry name
- CENTURYLINK-LEGACY-LIGHTCORE
- Registrant
- CenturyLink Communications, LLC
- Abuse contact
- abuse@aup.lumen.com
- Registered
- 2001-10-16
- Last changed
- 2018-08-14
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 335 with no ROA
- ROAs
- 0 authorising AS22561
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 335 announcements 11 other origin
- Route objects
- 0 naming AS22561
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: 447 networks and 1,848 prefixes, as published 2026-10-31. 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