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Autonomous System

AS209

CenturyLink

Organization
CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC
ASN
AS209
Country
United States
Category
ISP
Announced IPv4 prefixes
1625
Announced IPv6 prefixes
32
Registry
ARIN

By: Katia Belokon · Verified July 2026

IP Geolocation LookupWHOIS LookupVPN Leak Test

What is AS209?

AS209 is the autonomous system operated by CenturyLink, registered with ARIN. It currently announces 1625 IPv4 prefixes and 32 IPv6 prefixes to the global routing table. Addresses in this network belong to residential and mobile subscribers, so seeing AS209 in a lookup means the connection is a consumer line rather than a data center.

Check IPs in AS209 with MyIPScan tools

IP Geolocation LookupResolve any address to its ASN and location.WHOIS LookupRegistered CIDR block for any address.VPN Leak TestCheck whether your VPN hides your real IP.CenturyLink IP rangesAnnounced prefixes for this network.DNS Leak TestSee which resolver answers your queries.What Is an ASN?How autonomous systems identify networks.

Frequently asked questions about AS209

What is AS209?

AS209 is the autonomous system operated by CenturyLink, registered with ARIN. It currently announces 1625 IPv4 prefixes and 32 IPv6 prefixes to the global routing table. Addresses in this network belong to residential and mobile subscribers, so seeing AS209 in a lookup means the connection is a consumer line rather than a data center.

Who owns AS209?

AS209 is held by CenturyLink according to ARIN registry records. The registered holder name is CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC.

Why does AS209 appear in my VPN test?

If AS209 shows as your visible ASN while a VPN is connected, the tunnel is not carrying your traffic and your real CenturyLink connection is exposed to websites.

How large is the AS209 network?

By CAIDA's AS Rank, AS209 reaches 429 networks through its customer cone, covering roughly 42.9 million IPv4 addresses, placing it at global rank 131 among all autonomous systems.

How do I investigate IPs in AS209?

Use the MyIPScan IP Geolocation Lookup to resolve any address to its ASN and location, and WHOIS Lookup for the registered CIDR block. Addresses in this network return AS209 (CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC).