subnet.im

AS4015CenturyLink Communications, LLC

United StatesRegistryARIN

As of 10th November 2026, AS4015 (CenturyLink Communications, LLC), a network registered in the United States with ARIN, originates 4 IPv4 prefixes covering 14.3k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 8,817th-largest of the 80,723 networks we see originating IPv4, and the 2,794th-largest of 18,750 in the United States. It is seen behind 1 upstream network, most often AS209 (Lumen (ex. Qwest)). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

4

IPv6 prefixes

1

IPv4 addresses

14.3k

IPv6 /64s

65.5k

Upstream graph

The networks AS4015 is seen behind, one and two hops out, drawn from real AS paths.

AS4015Toward the internet core
Upstream graph for AS4015: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS4015CenturyLink Commu…This networkAS209Lumen (ex. Qwest)AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS4015 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS4015
NetworkCountryRelationshipPathsVantage pts
AS209Lumen (ex. Qwest)USPeer366138

Prefixes

The largest blocks AS4015 originates, widest first.

Largest prefixes originated by AS4015
PrefixAddressesVisibility
155.70.16.0/204.1k76/76
155.70.48.0/204.1k76/76
155.70.64.0/204.1k76/76
148.156.208.0/212k76/76
2001:428:b21::/4865.5k × /6462/63

Routing health

How AS4015's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%5

Propagation

  • Globally propagated90% of full-feed peers or more100.0%5
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 4 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS4015 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.