Autonomous system detail  ·  US flag US

AS111

Announced

Operated by Boston University, US flag US.

Summary

// analyst note
Encountered as legitimate university traffic; actively routed and low-risk. No RPKI ROAs published (minor routing-hygiene gap). RegDate 1987-05-11 (Confirmed ARIN).
// security note
NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-10; clean academic network.
IPv4 prefixes
11
~133.9K addresses
IPv6 prefixes
1
announced
Peer networks
4
4 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High  ·  2 sources  ·  How this page is checked

AS111 is a legacy spring-1987 allocation registered under ARIN to Boston University (OrgId BOSU-Z, 881 Commonwealth Avenue, Boston, MA), carrying the handle "BOSTONU-AS" — one of the earliest university ASNs, allocated 1987-05-11 (org record refreshed 2023). Boston University has operated it continuously as its campus production network for roughly 39 years. As of June 2026 it is actively announcing 12 prefixes (11 IPv4 + 1 IPv6, ~133,376 IPv4 addresses), including the historic 128.197.0.0/16 and 168.122.0.0/16 Class B blocks plus IPv6 2620:58::/32, with about 7 observed peers. Its upstreams and peers reflect a classic R&E mix: Cogent (AS174), Lumen/Level 3 (AS3356), Internet2 (AS11164/AS11537), Harvard University (AS10578), and the regional Boston GigaPoP (AS10961). One routing-hygiene note: no RPKI ROAs are published (0 valid originations observed), a minor gap worth flagging. For triage this is legitimate, actively-routed university traffic — clean and low-risk. No notable public abuse signal was found as of June 2026.

Operator
Boston University (ARIN OrgId BOSU-Z, Boston, MA) [Confirmed] — ARIN RDAP via bgp.tools
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN RDAP RegDate 1987-05-11 (ASN updated 2023-06-07; org record RegDate 2023-04-06) [Confirmed]
Org status
active

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-10; clean academic network — bgp.he.net

Network & routing

Network type
research / education (university) [Confirmed]
Size
12 prefixes (11 IPv4 + 1 IPv6; ~133,376 IPv4 addrs) — incl. 128.197.0.0/16, 168.122.0.0/16, 2620:58::/32 — bgp.he.net (2026-06-10)
Routing/peering
active; ~7 observed peers; upstreams/peers Cogent AS174, Lumen AS3356, Internet2 AS11164/AS11537, Harvard AS10578, Boston GigaPoP AS10961 — bgp.he.net
RPKI
none — 0 valid originations observed (no ROAs published) — bgp.he.net
Notable usage
[historical/current] AS111 "BOSTONU-AS" — one of the earliest university ASNs (allocated May 1987); BU's campus production network, peering through the Boston GigaPoP and Internet2 — bu.edu
Related ASNs
AS10961 (Boston GigaPoP), AS10578 (Harvard — peer) [Confirmed]
Analyst note
Encountered as legitimate university traffic; actively routed and low-risk. The absence of RPKI ROAs is a minor routing-hygiene gap worth flagging.
[ 02 ] — Announced prefixes

What this network routes.

12 prefixes total · as observed by RouteViews at 2026-09-20 · one collector view, not a global census
// IPv4 prefixes11
  1. 128.197.0.0/16/16
  2. 168.122.0.0/16/16
  3. 192.12.186.0/23/23
  4. 192.12.190.0/23/23
  5. 128.197.136.0/24/24
  6. 128.197.254.0/24/24
  7. 192.12.185.0/24/24
  8. 192.12.189.0/24/24
  9. 192.5.206.0/24/24
  10. 192.5.207.0/24/24
  11. 192.54.224.0/24/24
// IPv6 prefixes1
  1. 2631:5000::/28/28
[ 03 ] — Notable peers & upstreams

Who it talks to.

4 observed neighbours
// Notable connections4 of 4 observed

Neighbours observed by RouteViews at 2026-09-20, lowest ASN first. Relationships are inferences from the CAIDA AS Relationships Dataset, 2026-08-01, and establish no commercial arrangement; a dash means the inference did not resolve.

ASNOperatorRole
AS174 Cogent Communications, LLC upstream
AS3356 Level 3 Parent, LLC (Lumen Technologies) upstream
AS11164 — upstream
AS11537 — upstream
Neighbours observed via public BGP collectors; not a complete peering list.