subnet.im

AS3Massachusetts Institute of Technology

United StatesRegistryARINTypeEyeball

As of 22nd October 2026, AS3 (Massachusetts Institute of Technology), an access network registered in the United States with ARIN, originates 90 IPv4 prefixes covering 1.9M addresses and 9 IPv6 prefixes. By IPv4 address space that makes it the 289th-largest of the 79,663 networks we see originating IPv4, and the 69th-largest of 18,476 in the United States. It is seen behind 11 upstream networks, most often AS3356 (Lumen (Level 3)) and AS174 (Cogent Communications, LLC), and in front of 4 downstream networks. None of its announcements have a valid RPKI ROA; 2 are RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers, and 3 prefixes are also originated by another network.

At a glance

IPv4 prefixes

90

IPv6 prefixes

9

IPv4 addresses

1.9M

IPv6 /64s

38.7B

Upstream graph

The networks AS3 is seen behind, one and two hops out, drawn from real AS paths.

AS3Toward the internet core
Upstream graph for AS3: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3Massachusetts Ins…This networkAS174Cogent Communicat…AS293ESnetAS3356Lumen (Level 3)AS6939Hurricane Electri…AS7015Comcast Cable Com…AS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS20130Depaul UniversityAS132337AxclusiveAS7922Comcast Cable Com…

Networks observed one and two hops upstream of AS3 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

38

adjacent networks

Upstreams
1129%
Peers
2361%
Downstreams
411%

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

Upstreams of AS3
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer3,89562
AS174Cogent Communications, LLCUSPeer2,46880
AS6939Hurricane Electric LLCUSPeer59259
AS7015Comcast Cable Communications, LLCUSPeer783
AS293ESnetUSPeer711
AS133296Web Werks India Pvt. Ltd.INPeer6855
AS11164Internet2 I2PXUSPeer642
AS11537Internet2USPeer321
AS266306CENTRALNETT TELECOMBRPeer2626
AS138279Onepipe Telecom Pvt LtdINPeer1616

Prefixes

All 99

The largest blocks AS3 originates, widest first.

Largest prefixes originated by AS3
PrefixAddressesVisibility
128.30.0.0/15131k76/77
18.0.0.0/1665.5k76/77
18.1.0.0/1665.5k76/77
18.3.0.0/1665.5k76/77
18.4.0.0/1665.5k76/77
18.5.0.0/1665.5k76/77
18.6.0.0/1665.5k76/77
18.7.0.0/1665.5k76/77
18.8.0.0/1665.5k76/77
18.9.0.0/1665.5k76/77

Routing health

How AS3'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
  • Invalid2.0%2
  • No ROA98.0%97

Propagation

  • Globally propagated90% of full-feed peers or more97.0%96
  • Partially propagated40% to 90%1.0%1
  • Seen by few peersUnder 40%2.0%2

Prefix sizes

IPv4 — 90 prefixes

IPv6 — 9 prefixes

  • /324.3B × /64100.0%9

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.