AS598

AS598 is a legacy autonomous system number registered under ARIN to Level 3 Parent, LLC, the entity that today operates as a subsidiary of Lumen Technologies, Inc. The registration lineage traces the well-known industry consolidation: Level 3 Communications was acquired by CenturyLink in 2017, and CenturyLink rebranded itself Lumen Technologies in 2020 — the AS name "CENTURYLINK-LEGACY-LVLT-598" preserves that history in a single string. ARIN's RDAP record shows the autnum's own top-level registration event dated 2002-06-05, with a last-changed event of 2019-12-04; this is a first-party registry fact and is corroborated independently by four separate research angles, distinct from several decoy entity-level dates (contact-handle registrations for LAC56-ARIN, APL7-ARIN, RPKIR-ARIN, and org LPL-141) that appear elsewhere in the same RDAP payload. Operationally, AS598 is dormant: multiple routing-data sources (RIPEstat, CAIDA AS Rank, bgp.he.net, bgp.tools) agree it currently announces zero IPv4 and zero IPv6 prefixes and has not appeared in the global routing table since mid-May 2024. Its only historically observed BGP relationship is to AS3356, Level 3 Parent's own active peering ASN — an intra-organization link rather than a third-party peer. No independent PeeringDB record or abuse history was found for AS598 specifically.

Operator

Level 3 Parent, LLC, a subsidiary of Lumen Technologies, Inc. [Confirmed] — https://rdap.arin.net/registry/autnum/598, https://www.lumen.com/en-us/about.html

AS name

CENTURYLINK-LEGACY-LVLT-598 [Confirmed] — https://rdap.arin.net/registry/autnum/598

Country / RIR

US, ARIN [Confirmed] — https://rdap.arin.net/registry/autnum/598

Allocated

2002-06-05 (ARIN RDAP autnum TOP-LEVEL registration event, not an entity/contact-handle date); last changed 2019-12-04 [Confirmed, corroborated by 4 independent angles] — https://rdap.arin.net/registry/autnum/598

Org status

administratively "active" per ARIN RDAP status; Level 3 Parent, LLC is part of publicly traded Lumen Technologies, Inc.; no operator-official statement located confirming whether AS598 is formally retired versus simply dormant/unused [Confirmed for admin status; Unknown for retirement intent] — https://rdap.arin.net/registry/autnum/598

Contacts

abuse@level3.com; ipadmin@lumen.com / ipadmin@centurylink.com; rpki-roa@lumen.com; HQ contacts at 100 CenturyLink Drive, Monroe, LA 71203 and 1025 Eldorado Blvd., Broomfield, CO 80021 [Confirmed] — https://rdap.arin.net/registry/autnum/598

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-07-16 — checked Spamhaus ASN-DROP, NANOG archives, AbuseIPDB, and Lumen/CenturyLink Black Lotus Labs public threat research

Network & routing

Network type

legacy Level 3 Communications ASN, absorbed into CenturyLink (2017 acquisition) then rebranded Lumen Technologies (2020); parent org operates a global Tier 1 IP backbone [Likely] — https://www.lumen.com/en-us/about.html, https://bgp.he.net/AS598

Size / routing status

dormant — 0 IPv4 and 0 IPv6 prefixes currently announced; not visible in the global routing table since 2024-05-16; customer cone = 1 ASN (itself), 0 prefixes, 0 addresses; CAIDA AS Rank 79459

[Confirmed] — https://stat.ripe.net/AS598, https://bgp.he.net/AS598, https://bgp.tools/as/598, https://asrank.caida.org/asns/598

Upstreams / peers

no current upstreams observed; the only historically-observed IPv4 peer is AS3356 (also Level 3 Parent, LLC / Lumen — an intra-org relationship, not a distinct third party) [Likely] — https://bgp.he.net/AS598, https://asrank.caida.org/asns/598

Peering policy

no dedicated PeeringDB record for AS598 (peeringdb.com/asn/598 returns 404); Lumen's published settlement-free peering policy is scoped to its active peering ASN AS3356, not AS598 [Likely] — https://www.lumen.com/en-us/about/legal/peering-policy.html, https://www.peeringdb.com/net/504

RPKI

not independently verifiable for AS598 specifically — no currently announced prefix exists to validate against a ROA; RDAP lists an RPKIR-ARIN routing-role contact ("For creating ROA's") indicating the registrant (Lumen) has ROA-management capability at the org level

[Unknown for AS598-specific coverage] — https://rdap.arin.net/registry/autnum/598

Geo footprint

US-based; registrant/contact addresses in Monroe, LA (abuse, RPKI-ROA contacts) and Broomfield, CO (admin/technical POC); no IXP presence recorded [Confirmed] — https://rdap.arin.net/registry/autnum/598, https://asrank.caida.org/asns/598

Related ASNs

AS3356 (Level 3 Parent, LLC's active peering ASN, historically the only observed peer of AS598) [Confirmed] — https://bgp.he.net/AS598

Historical announcements

previously originated at least 204.199.128.0/24 (first seen 2012-05-12) and 64.211.148.0/24 (last seen 2024-05-10) [Confirmed] — https://stat.ripe.net/AS598

Analyst note

legacy Level 3 numbering resource under Lumen's ARIN org, dormant in live BGP since mid-2024 with no independent peering presence; its only routing relationship is an intra-org link to Lumen's active ASN AS3356.