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AS19Leidos, Inc.

United StatesRegistryARIN

As of 22nd October 2026, AS19 (Leidos, Inc.), a network registered in the United States with ARIN, originates 26 IPv4 prefixes covering 260k addresses and 3 IPv6 prefixes. By IPv4 address space that makes it the 1,108th-largest of the 79,663 networks we see originating IPv4, and the 305th-largest of 18,476 in the United States. It is seen behind 3 upstream networks, most often AS6461 (Zayo Bandwidth) and AS62 (CyrusOne LLC). 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

26

IPv6 prefixes

3

IPv4 addresses

260k

IPv6 /64s

302M

Upstream graph

The networks AS19 is seen behind, one and two hops out, drawn from real AS paths.

AS19Toward the internet core
Upstream graph for AS19: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19Leidos, Inc.This networkAS62CyrusOne LLCAS3356Lumen (Level 3)AS6461Zayo BandwidthAS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS32590Valve Corporation

Networks observed one and two hops upstream of AS19 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

6

adjacent networks

Upstreams
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS19
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer1,02978
AS62CyrusOne LLCUSPeer610104
AS3356Lumen (Level 3)USPeer53871

Prefixes

All 29

The largest blocks AS19 originates, widest first.

Largest prefixes originated by AS19
PrefixAddressesVisibility
140.162.0.0/1665.5k77/77
149.8.0.0/1665.5k76/77
149.8.0.0/1732.8k77/77
149.8.128.0/1732.8k77/77
140.162.64.0/1816.4k76/77
140.162.128.0/1816.4k77/77
140.162.192.0/1816.4k76/77
140.162.24.0/212k76/77
140.162.40.0/212k77/77
204.115.176.0/212k77/77

Routing health

How AS19'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%29

Propagation

  • Globally propagated90% of full-feed peers or more100.0%29
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 26 prefixes

IPv6 — 3 prefixes

  • /36268M × /6433.3%1
  • /4016.8M × /6466.7%2

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS19 started or stopped in this period.

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