AS201

AS201 is a low-number, legacy autonomous system registered under ARIN to Level 3 Parent, LLC — a wholly-owned subsidiary of Lumen Technologies, Inc. (NYSE: LUMN), the US backbone carrier formerly known as CenturyLink. The ARIN-registered name is CENTURYLINK-LEGACY-LVLT-201, held under org handle LPL-141, and the registry remarks tie every address block under the org-ID to Lumen's non-portable IP-space and acceptable-use policy. The triage point for AS201 is that it is effectively dormant: every routing source consulted (Hurricane Electric bgp.he.net, bgp.tools, RIPEstat, ipinfo.io) agrees the ASN has been withdrawn from the global routing table since approximately June 13, 2022 and currently originates zero IPv4 and zero IPv6 prefixes. Lumen's live backbone routing is consolidated under AS3356; AS201 is one of many legacy Level 3 ASNs retained after CenturyLink acquired Level 3 Communications in 2017. RPKI infrastructure exists on the record (RDAP routing-role entity RPKIR-ARIN, registered 2024-06-17, contact rpki-roa@lumen.com), but with no active announcements there are no originated ROAs to validate. The only security-adjacent flag is a historic bogon IPv6 announcement (2403:f940:1000::/36) seen via a single observed peering session with AS139335 (Sreejon Online.Com, Bangladesh) — attributable to a route-leak / re-origination artifact, not Lumen conduct. No abuse signal for AS201 itself was found on Spamhaus, CleanTalk, NANOG archives, or other feeds as of 2026-06-19.

Operator

Level 3 Parent, LLC (wholly-owned subsidiary of Lumen Technologies, Inc.; ARIN org handle LPL-141) [Confirmed] — ARIN RDAP autnum/201, sec.gov EDGAR (Lumen)

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/201

Allocated

2002-06-05 (ARIN autnum top-level registration event — a first-party RIR fact, not an IEEE date); last changed 2019-12-04 [Confirmed] — ARIN RDAP autnum top-level events (read directly via fetch-canonical.mjs by A3)

Org status

active — Level 3 Parent, LLC is a Delaware private subsidiary wholly owned by Lumen Technologies, Inc. (NYSE: LUMN), HQ 100 CenturyLink Drive, Monroe, LA 71203, USA [Confirmed] — sec.gov EDGAR, ARIN RDAP autnum/201

Contacts

abuse@level3.com / abuse@aup.lumen.com; admin/tech ipadmin@lumen.com / ipadmin@centurylink.com; +1-877-453-8353; RPKI rpki-roa@lumen.com [Confirmed] — ARIN RDAP autnum/201

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal for AS201 found as of 2026-06-19 — not on Spamhaus SBL/ASN-DROP, CleanTalk ASN list, AbuseIPDB, NANOG archives, or general incident feeds. Only flag is a historic bogon IPv6 prefix (2403:f940:1000::/36) tied to the AS139335 session, not Lumen

Network & routing

Network type

NSP / Tier 1 backbone operator (Lumen/Level 3); AS201 is legacy/inactive — active backbone routing runs under AS3356 [Confirmed] — peeringdb.com/net/504, bgp.he.net/AS201

Size

dormant — 0 IPv4 prefixes / 0 IPv4 addresses and 0 IPv6 prefixes; withdrawn from global routing since ~2022-06-13 [Confirmed] — bgp.he.net/AS201, bgp.tools/as/201

Routing/peering

NOT announced — 0 prefixes, no active upstreams or peers. Historically one IPv6-only session observed with AS139335 (Sreejon Online.Com, Bangladesh), likely a route-leak/bogon artifact rather than real peering [Likely] — bgp.he.net/AS201

RPKI

infrastructure present (RDAP routing entity RPKIR-ARIN, registered 2024-06-17, contact rpki-roa@lumen.com) but not assessable for originations — AS201 announces no prefixes, so there are 0 RPKI-valid and 0 RPKI-invalid origins [Confirmed] — ARIN RDAP autnum/201, bgp.he.net/AS201

Peering policy

Restrictive — Lumen's settlement-free peering requires 24/7 NOC, RPKI filtering, public looking glass, and high traffic/ASN-reach thresholds; contract required; contact peering@lumen.com [Confirmed] — lumen.com/peering, peeringdb.com/net/504

Notable usage

legacy Level 3 / CenturyLink ASN under the Lumen umbrella, retained after the 2017 CenturyLink–Level 3 merger. IP blocks are non-portable (customer use tied to active Lumen service). The AS has originated zero prefixes since ~June 2022; backbone routing is under AS3356

[Confirmed] — bgp.he.net/AS201, ARIN RDAP autnum/201, en.wikipedia.org/wiki/Level_3_Communications

Related ASNs

AS3356 (Lumen/Level 3 active backbone); AS201 sits in the legacy LVLT-199-203 range block [Confirmed for AS3356; Likely for the block range per third-party DBs] — bgp.he.net/AS201, ipinfo.io/AS201

Analyst note

dormant/legacy ASN registered to a major US Tier 1 carrier (Lumen/Level 3). WHOIS resolves to Level 3 Parent, LLC, but live routing is under AS3356, not AS201. Note A1's truncated input surfaced an org-handle (LPL-141) registration of 2018-02-06; A3 read the actual autnum TOP-LEVEL events and confirmed allocated_date 2002-06-05 — that is the registry fact recorded here.