AS10

AS10 is a legacy single-digit allocation whose ARIN record still names the long-defunct CSNET Coordination and Information Center (CSNET-CIC), listed at a BBN Systems and Technologies address in Cambridge, MA, with a contact handle carrying a genuity.com email — a BBN/Genuity legacy. This is a fossilized registration: CSNET, the Computer Science Network, began operation in 1981 (NSF-funded at roughly $5 million over five years) to extend networking to computer-science departments not on ARPANET; its Coordination and Information Center, operated by BBN from around 1984, functioned as the first ISP-style support center, and CSNET merged with BITNET in 1989 into CREN and was shut down in October 1991. The org of record has therefore been defunct since about 1991 and the record was never updated to a live successor. Current routing is minimal-to-dormant and source-dependent: Hurricane Electric shows about five prefixes (four IPv4, one IPv6, ~2,300 addresses) while bgp.tools/BGPView show only one IPv4 prefix or none announced, with intermittent visibility via BBN/Genuity-legacy upstreams. For triage, this is the riskiest of the batch to misread — do not treat "CSNET" as a live operator; report it as a historically important but fossilized registration with minimal current routing, and flag any sudden increase in originated prefixes as anomalous given the defunct registrant. Several aggregators display a 1970-01-01 date, which is a Unix-epoch placeholder, not a real allocation date. No notable public abuse signal was found as of June 2026.

Operator (registry record)

CSNET Coordination and Information Center (CSNET-CIC) (ARIN OrgId CCICC; address BBN Systems and Technologies, Cambridge, MA; contact CS15-ARIN with genuity.com email) [Confirmed — defunct org of record]

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate blank (Updated 2000-04-18); aggregators showing 1970-01-01 = Unix-epoch placeholder, NOT a real date; original assignment Unknown

Org status

legacy / dormant — org of record defunct since ~1991; only minimal/intermittent routing observed via BBN/Genuity legacy infrastructure

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-07. The stale registration itself is the key analyst flag — org of record defunct since ~1991, contact points to a Genuity-era address; warrants extra scrutiny if it ever originates unexpected routes — bgpview.io

Network & routing

Network type

other / legacy (defunct academic-network org; record never updated to a live successor) [Confirmed]

Size

source-dependent and minimal — HE ~5 prefixes (IPv4 4, IPv6 1; ~2,304 addrs); bgp.tools/BGPView show 1 IPv4 prefix / 0 announced; appears largely dormant-to-minimal/intermittent — bgp.he.net / bgp.tools (2026-06)

Routing/peering

upstreams observed incl. Cogent (AS174), Level 3 (AS10753), TekSavvy, Hurricane Electric (AS6939), Montreal IX (AS55176); HE flags "announces bogons"; RPKI valid 0, invalid 1 (IPv6), remainder unknown — bgp.he.net

Notable usage

[historical] CSNET (Computer Science Network) began 1981 (NSF-funded ~$5M over 5 years) to extend networking to CS departments off ARPANET; CIC operated by BBN from ~1984 as the first ISP-style support center; merged with BITNET into CREN (1989); shut down Oct 1991. [current] ARIN record still names the defunct CSNET CIC at a BBN/Genuity address — fossilized — en.wikipedia.org/wiki/CSNET

Related ASNs

historically tied to BBN/Genuity (networking business passed through GTE/Genuity into Verizon's legacy); no live sibling confirmed

Analyst note

The riskiest-to-misread of this cohort — do NOT treat "CSNET" as a live operator. Report as a historically important but fossilized registration with minimal current routing; flag any sudden increase in originated prefixes as anomalous.