subnet.im

AS668DoD High Performance Computing (Defense Research and Engineering Network)

United StatesRegistryARIN

As of 22nd October 2026, AS668 (DoD High Performance Computing (Defense…), a network registered in the United States with ARIN, originates 192 IPv4 prefixes covering 2.6M addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 223rd-largest of the 79,655 networks we see originating IPv4, and the 57th-largest of 18,475 in the United States. It is seen behind 5 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS2914 (NTT America, Inc.), and in front of 27 downstream networks. 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

192

IPv6 prefixes

1

IPv4 addresses

2.6M

IPv6 /64s

4.3B

Upstream graph

The networks AS668 is seen behind, one and two hops out, drawn from real AS paths.

AS668Toward the internet core
Upstream graph for AS668: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS668DoD High Performa…This networkAS293ESnetAS701Verizon BusinessAS2153CENICAS2914NTT America, Inc.AS6939Hurricane Electri…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS2152CENIC - CalRENAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS20130Depaul UniversityAS132337Axclusive

Networks observed one and two hops upstream of AS668 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

74

adjacent networks

Upstreams
57%
Peers
4257%
Downstreams
2736%

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

Upstreams of AS668
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer20,922137
AS2914NTT America, Inc.USPeer1,81434
AS701Verizon BusinessUSPeer79247
AS2153CENICUSPeer2881
AS293ESnetUSPeer2811

Prefixes

All 193

The largest blocks AS668 originates, widest first.

Largest prefixes originated by AS668
PrefixAddressesVisibility
6.4.0.0/1665.5k77/77
128.132.0.0/1665.5k77/77
129.92.0.0/1665.5k77/77
129.229.0.0/1665.5k77/77
130.109.0.0/1665.5k77/77
130.163.0.0/1665.5k77/77
131.120.0.0/1665.5k77/77
131.121.0.0/1665.5k77/77
131.122.0.0/1665.5k77/77
131.214.0.0/1665.5k77/77

Routing health

How AS668'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%193

Propagation

  • Globally propagated90% of full-feed peers or more100.0%193
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 192 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

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