subnet.im

AS396173Southwest Airlines Co.

United StatesRegistryARIN

As of 10th November 2026, AS396173 (Southwest Airlines Co.), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 768 addresses. By IPv4 address space that makes it the 45,659th-largest of the 80,723 networks we see originating IPv4, and the 9,531st-largest of 18,750 in the United States. It is seen behind 1 upstream network, most often AS32787 (Akamai (Prolexic)). 67% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

3

IPv6 prefixes

0

IPv4 addresses

768

IPv6 /64s

0

Upstream graph

The networks AS396173 is seen behind, one and two hops out, drawn from real AS paths.

AS396173Toward the internet core
Upstream graph for AS396173: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS396173Southwest Airline…This networkAS32787Akamai (Prolexic)AS2914NTT America, Inc.AS6453TATA Communicatio…

Networks observed one and two hops upstream of AS396173 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 AS396173
NetworkCountryRelationshipPathsVantage pts
AS32787Akamai (Prolexic)USPeer22876

Prefixes

The largest blocks AS396173 originates, widest first.

Largest prefixes originated by AS396173
PrefixAddressesVisibility
66.150.1.0/2425676/76
208.184.0.0/2425676/76
208.185.44.0/2425676/76

Routing health

How AS396173'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

  • Valid66.7%2
  • Invalid0.0%0
  • No ROA33.3%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS396173 started or stopped in this period.

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