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AS numbers

AS3 Massachusetts Institute of Technology

AS3 is operated by Massachusetts Institute of Technology and registered with ARIN.

It announces 89 IPv4 and 9 IPv6 prefixes, 0% of them RPKI valid.

RIPE RIS sees 13 upstream and peer networks and 6 downstream networks next to it.

PeeringDB lists it as an Educational/Research network at 1 internet exchange and 2 facilities. Its peering policy is restrictive.

Run the full network report BGP lookup WHOIS PeeringDB lookup
NameMassachusetts Institute of Technology
Registry handleMIT-GATEWAYS
Registry (RIR)ARIN
CountryUnited States (US)
Network typeEducational/Research, North America
Peering policyRestrictive
Prefixes (IPv4 / IPv6)89 / 9
RPKI valid0% (0 / 98)
Upstreams and peers13
Downstream networks6
Websitemit.edu

Routing health

  • AS3 announces 89 IPv4 and 9 IPv6 prefixes.
  • 98 announced prefixes are not covered by a ROA of AS3 (they may have none, or another network’s).
  • 13 upstreams and peers, 6 downstream networks seen.

For every check with the fix (IRR route objects, the RPKI state of each route, reverse DNS and the registration), run the full network report.

Announced prefixes 98

  • 18.0.0.0/16
  • 18.1.0.0/16
  • 18.3.0.0/16
  • 18.3.1.0/24
  • 18.3.2.0/24
  • 18.3.3.0/24
  • 18.3.4.0/24
  • 18.3.5.0/24
  • 18.3.6.0/24
  • 18.3.7.0/24
  • 18.3.8.0/24
  • 18.3.9.0/24
  • 18.3.10.0/24
  • 18.3.11.0/24
  • 18.3.12.0/24
  • 18.3.13.0/24
  • 18.3.14.0/24
  • 18.3.15.0/24
  • 18.3.16.0/24
  • 18.3.17.0/24
  • 18.3.18.0/24
  • 18.3.19.0/24
  • 18.3.20.0/24
  • 18.3.21.0/24
  • 18.3.22.0/24
  • 18.3.23.0/24
  • 18.3.28.0/24
  • 18.3.67.0/24
  • 18.3.69.0/24
  • 18.3.90.0/24
  • 18.3.103.0/24
  • 18.3.104.0/24
  • 18.3.105.0/24
  • 18.3.106.0/24
  • 18.3.108.0/24
  • 18.3.109.0/24
  • 18.3.111.0/24
  • 18.3.116.0/24
  • 18.3.122.0/24
  • 18.3.151.0/24
  • 18.3.152.0/24
  • 18.3.153.0/24
  • 18.3.154.0/24
  • 18.3.155.0/24
  • 18.4.0.0/16
  • 18.5.0.0/16
  • 18.6.0.0/16
  • 18.7.0.0/16
  • 18.7.23.0/24
  • 18.7.32.0/24
  • 18.7.34.0/24
  • 18.7.39.0/24
  • 18.7.40.0/24
  • 18.7.54.0/24
  • 18.7.80.0/24
  • 18.7.82.0/24
  • 18.7.84.0/24
  • 18.7.102.0/24
  • 18.7.108.0/24
  • 18.7.117.0/24
  • 18.7.118.0/24
  • 18.7.119.0/24
  • 18.7.120.0/24
  • 18.8.0.0/16
  • 18.9.0.0/16
  • 18.10.0.0/16
  • 18.11.0.0/16
  • 18.12.0.0/16
  • 18.13.0.0/16
  • 18.14.0.0/16
  • 18.15.0.0/16
  • 18.16.0.0/16
  • 18.17.0.0/16
  • 18.18.0.0/16
  • 18.22.0.0/16
  • 18.23.0.0/16
  • 18.25.0.0/16
  • 18.26.0.0/16
  • 18.27.0.0/16
  • 18.29.0.0/16
  • 18.31.0.0/16
  • 103.182.177.0/24
  • 128.30.0.0/15
  • 128.52.0.0/16
  • 192.52.61.0/24
  • 192.52.62.0/24
  • 192.52.63.0/24
  • 192.52.64.0/24
  • 192.52.65.0/24
  • 2603:400a::/32
  • 2603:4000::/32
  • 2603:4001::/32
  • 2603:4007::/32
  • 2603:4008::/32
  • 2603:4009::/32
  • 2603:4010::/32
  • 2603:4011::/32
  • 2804:35c8::/32

Upstreams and peers 13

The networks RIPE RIS sees next to AS3 in BGP paths, the most visible first.

Peering

Peering policy: Restrictive. Suggested max-prefix limits: 10 IPv4, 1 IPv6. PeeringDB record

Internet exchanges 1
ExchangePortsSpeedRoute server
MASS-IX: ISP Peering LAN2200GNo
Facilities 2
FacilityCityCountry
Lumen BostonCambridgeUS
Markley Group One Summer Street BostonBostonUS

More about AS3

Sources: RIR delegation data and PeeringDB (updated daily); routing from RIPEstat (RIPE NCC RIS and RPKI), refreshed daily. Routing data from 2026-11-15 15:11 UTC. The country is where the AS number was registered, not necessarily where the network operates.