Autonomous system detail

AS44

Announced

Operated by S1-DOMAIN - Lawrence Livermore National Laboratory.

Summary

// analyst note
An active DOE national-lab network reachable via ESnet. Both AS44 and sibling AS45 are active LLNL networks (AS44 is not dormant). The ~23,552 IPv4 address figure is the active-origination total.
// security note
NEUTRAL/DATED: no notable public abuse signal found as of 2026-06-09; benign national-lab traffic.
IPv4 prefixes
6
~23.6K addresses
IPv6 prefixes
0
—
Peer networks
1
1 up · 0 down
IANA block
1-1876
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High

AS44 is a legacy allocation registered under ARIN to Lawrence Livermore National Laboratory (org LLNL-1), a U.S. DOE/NNSA national laboratory, carrying the historical handle "S1-DOMAIN" — a reference to the S-1 Project at LLNL, a Navy/DoD supercomputer research effort of the late 1970s and 1980s. The current holder matches the historical label. The ASN is actively announcing in 2026: about six IPv4 prefixes (roughly 23,552 addresses — including 134.9.0.0/18, 134.9.64.0/20, 134.9.80.0/21, 134.9.255.0/24, 192.12.135.0/24, 192.12.136.0/23) and no IPv6, reachable via AS293 (ESnet, the DOE Energy Sciences Network). LLNL operates both AS44 and its sibling AS45 as active networks within ESnet's customer cone. The ARIN ASN RegDate is 1985-06-05. For triage this is an active DOE national-lab network reachable via ESnet, carrying benign research traffic. No notable public abuse signal was found as of June 2026.

Operator
Lawrence Livermore National Laboratory (ARIN OrgId LLNL-1) [Confirmed] — ARIN RDAP
Country / RIR
US, ARIN [Confirmed]
Allocated
ARIN ASN RegDate 1985-06-05 (updated 2024-10-31) [Confirmed] — ARIN RDAP
Org status
active — llnl.gov

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-09; benign national-lab traffic — bgp.he.net

Network & routing

Network type
government / research (US DOE/NNSA national laboratory) [Confirmed]
Size
actively announcing 6 IPv4 prefixes (~23,552 addrs), 0 IPv6 — whois.ipip.net / bgp.he.net (2026-06)
Routing/peering
active; reachable via AS293 (ESnet); RPKI unknown — whois.ipip.net
Notable usage
[historical, RFC 1020] AS44 "S1-DOMAIN" = the S-1 Project at LLNL (a Navy/DoD supercomputer research effort, late 1970s–80s). [current] held by LLNL; actively announces ~6 IPv4 prefixes via ESnet — llnl.gov
Related ASNs
AS45 (also LLNL — separate active network); AS293 (ESnet — upstream) [Confirmed]
Analyst note
An active DOE national-lab network reachable via ESnet. Both AS44 and sibling AS45 are active LLNL networks (AS44 is not dormant).
[ 02 ] — Announced prefixes

What this network routes.

6 prefixes total · RIPEstat data · cached, not real-time
// IPv4 prefixes6
  1. 134.9.0.0/18/18
  2. 134.9.64.0/20/20
  3. 134.9.80.0/21/21
  4. 192.12.136.0/23/23
  5. 134.9.255.0/24/24
  6. 192.12.135.0/24/24
// IPv6 prefixes0
No IPv6 prefixes announced.
[ 03 ] — Notable peers & upstreams

Who it talks to.

1 observed neighbour
// Notable connectionsTop 1 of 1
ASNOperatorRole
AS293 ESNET - ESnet upstream
Neighbours observed via public BGP collectors; not a complete peering list.