CenturyLink IP Ranges
CenturyLink is the consumer and business access network of Lumen Technologies, and ARIN's own name for it records where it came from: AS209 is registered as CENTURYLINK-US-LEGACY-QWEST, allocated in November 1998. It is not the Lumen backbone that carries transit.
- Provider
- CenturyLink
- Primary ASN
- AS209
- Category
- ISP
- Headquarters
- Monroe, LA, USA
- Announced IPv4 prefixes
- 1595
- Registry
- ARIN
Known IP ranges
These prefixes are currently announced to the global routing table by AS209 (CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC). Prefix sets change over time - use WHOIS Lookup for the authoritative record on any specific address.
65.128.0.0/11
63.144.0.0/12
174.16.0.0/12
71.208.0.0/12
65.112.0.0/12
63.224.0.0/12
75.160.0.0/12
97.112.0.0/12
71.48.0.0/13
67.128.0.0/13
2602::/24
2001:460::/32
2604:8c0::/32 (IPv6)
What does a CenturyLink IP mean in a privacy test?
A CenturyLink address as your visible IP means the connection left over the access line itself with no tunnel in the path. It is worth separating from the other Lumen network: AS209 is where subscriber and enterprise lines sit, while AS3356 is the Tier 1 backbone that shows up mid-traceroute for traffic that never touched a CenturyLink line at all.
Where to get CenturyLink's address list
No allowlist is published for this network, so the registry is the source. ARIN records AS209 under the AS name CENTURYLINK-US-LEGACY-QWEST, registered to CenturyLink Communications, LLC on 13 November 1998, and the prefixes above are the largest currently announced. The AS209 page carries the registry record with the routing detail beside it.
The name in that record is not decoration. Qwest is one of the companies Lumen was assembled from, and the access network kept both the ASN and the reverse DNS it had beforehand: 65.128.0.1 still answers as 65-128-0-1.mpls.qwest.net, the qwest.net zone intact with a three-letter city code in front of it. So an address that reads as Qwest in a PTR lookup, as CenturyLink on a bill and as Lumen in a press release is, in the routing table, plain AS209.
AS209 and AS3356 are not the same network
Lumen operates two networks a lookup can easily confuse. AS3356, the former Level 3 backbone, is Tier 1 transit: its addresses turn up as hops in a traceroute between other people's networks, and this site covers it separately on the Lumen IP ranges page. AS209 is the access side - the copper, fibre and enterprise circuits sold under the CenturyLink and Quantum Fiber names - and its addresses are endpoints rather than waypoints.
That distinction is what tells you how to read a match. An AS3356 address as somebody's visible IP usually means a hosting or enterprise service buying Lumen transit, not a home line. An AS209 address as a visible IP means the line itself. The reverse DNS keeps the two apart as reliably as the ASN does, since the access network's names sit under qwest.net rather than anywhere in the backbone's zone.
Related tools
Frequently asked questions
What IP ranges does CenturyLink use?
CenturyLink announces its access network under AS209, which ARIN registers to CenturyLink Communications, LLC under the AS name CENTURYLINK-US-LEGACY-QWEST. The largest blocks currently routed there are listed above, among them 65.128.0.0/11 and 63.144.0.0/12. No range file is published, so the ARIN record is the checkable source.
Why does a CenturyLink IP appear in my privacy test?
A CenturyLink address as your visible IP means the connection left over the access line itself with no tunnel in the path. It is worth separating from the other Lumen network: AS209 is where subscriber and enterprise lines sit, while AS3356 is the Tier 1 backbone that shows up mid-traceroute for traffic that never touched a CenturyLink line at all.
Is CenturyLink the same network as Lumen?
The company is the same; the networks are two. CenturyLink rebranded as Lumen Technologies in September 2020, but AS209 - which ARIN still names CENTURYLINK-US-LEGACY-QWEST - is the access network subscribers connect on, while AS3356 is the former Level 3 backbone that carries transit. This site covers AS3356 on its own page.
Why does a CenturyLink IP have a qwest.net hostname?
Because the reverse DNS was never renamed. Qwest is one of Lumen's predecessor companies and the access network kept its zone: 65.128.0.1 answers as 65-128-0-1.mpls.qwest.net, with a three-letter city code before the domain. The hostname is historical, the ASN is current.
Does CenturyLink publish its IP ranges?
Not as a file. The addresses announced under AS209 appear in the ARIN registry record and in the global routing table, and the largest of them are listed above. There is nothing to poll, which is the normal state of affairs for a network whose addresses belong to customers rather than to services.