AS4015 — CENTURYLINK-LEGACY-QWEST-SPA-OMAHA

AS4015 announces 4 IPv4 prefixes covering 14,336 addresses and 1 IPv6 prefixes.

About this network

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.

Announced prefixes

• 148.156.208.0/21
• 155.70.16.0/20
• 155.70.48.0/20
• 155.70.64.0/20
• 2001:428:b21::/48

Upstream networks

• AS209 CenturyLink Communications, LLC

Adjacent networks

• AS209 CenturyLink Communications, LLC