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AS63Massachusetts Institute of Technology

United StatesRegistryARIN

As of 22nd October 2026, AS63 (Massachusetts Institute of Technology), a network registered in the United States with ARIN, originates 6 IPv4 prefixes covering 67.8k addresses. By IPv4 address space that makes it the 3,235th-largest of the 79,655 networks we see originating IPv4, and the 1,080th-largest of 18,475 in the United States. It is seen behind 3 upstream networks, most often AS13789 (Unitas Global) and AS11164 (Internet2 I2PX). 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

6

IPv6 prefixes

0

IPv4 addresses

67.8k

IPv6 /64s

0

Upstream graph

The networks AS63 is seen behind, one and two hops out, drawn from real AS paths.

AS63Toward the internet core
Upstream graph for AS63: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS63Massachusetts Ins…This networkAS11164Internet2 I2PXAS11537Internet2AS13789Unitas GlobalAS2152CENIC - CalRENAS2497Internet Initiati…AS293ESnetAS2153CENICAS1828PacketFabric / Un…

Networks observed one and two hops upstream of AS63 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 AS63
NetworkCountryRelationshipPathsVantage pts
AS13789Unitas GlobalUSPeer40267
AS11164Internet2 I2PXUSPeer488
AS11537Internet2USPeer122

Prefixes

The largest blocks AS63 originates, widest first.

Largest prefixes originated by AS63
PrefixAddressesVisibility
129.55.0.0/1665.5k77/77
192.5.136.0/221k77/77
192.5.140.0/2351277/77
129.55.201.0/2425677/77
192.26.149.0/2425677/77
192.26.150.0/2425677/77

Routing health

How AS63'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%6

Propagation

  • Globally propagated90% of full-feed peers or more100.0%6
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS63 started or stopped in this period.

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