AS2

AS2 is a legacy single-digit allocation registered under ARIN to the University of Delaware. The "DCN" in the handle refers to the Distributed Computer Network work of David L. Mills (1938–2024), author of the Network Time Protocol and creator of the "Fuzzball" routers — DEC PDP-11 minicomputers running Mills's routing software that, per the University of Delaware, were used in 1986 to build the first 56 kbit/s NSFNET backbone, a precursor to today's Internet. That heritage is historical; the current holder is University of Delaware campus networking, which holds 128.4.0.0/16 and still actively announces the ASN, though at small scale (about three IPv4 prefixes and seven IPv6 prefixes, ~70,000 IPv4 addresses). CAIDA ranks it #13,496 with a single-ASN cone. For triage this is a clean academic network encountered in research/education traceroutes and historical NTP/Fuzzball context; the only technical notes are two RPKI-invalid IPv6 origins and a Hurricane Electric "announces bogons" flag, both hygiene items rather than abuse. The shown ARIN RegDate of 1991-01-10 is a later registry refresh, not the original 1980s assignment, which the registry does not expose. No notable public abuse signal was found as of June 2026.

Operator

University of Delaware (ARIN OrgId UNIVER-19-Z, Newark, DE) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1991-01-10 (later registry refresh, NOT original assignment; org RegDate 2008-03-18); original assignment Unknown

Org status

active — udel.edu

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-07; clean academic network. IPv6-invalid ROAs and bogon flag are hygiene items, not abuse — bgpview.io

Network & routing

Network type

research / education [Confirmed]

Size

~3 IPv4 prefixes, 7 IPv6 (~70,144 IPv4 addrs); holds 128.4.0.0/16 — bgp.he.net (2026-06)

Routing/peering

actively announcing; HE flags "announces bogons"; CAIDA AS Rank #13,496, cone 1 ASN / 5 prefixes / 70,400 addrs; RPKI valid 1, invalid 2 (both IPv6), remainder unknown — bgp.he.net, asrank.caida.org

Notable usage

[historical] "DCN" = David L. Mills's Distributed Computer Network; Mills authored NTP and the Fuzzball routers (six Fuzzballs built the first 56 kbit/s NSFNET backbone in 1986). [current] University of Delaware campus network — udel.edu

Related ASNs

University of Delaware was a CSNET Phonenet email-relay site (see AS10 history); no other confirmed sibling ASN

Analyst note

A legacy single-digit university ASN, still live but tiny; encountered in research/education traceroutes and historical NTP/Fuzzball context.