AS1581
No prefixes for this AS number were observed in the RouteViews RIB.
Summary
- // analyst note
- Combined observation across route-views2 and route-views6 at 2026-11-06T20:00:00.000Z; zero prefixes and AS_PATH neighbors observed. Absence in this snapshot does not establish inactivity.
About this ASN.
AS1581 is an ASN whose registered organization and operational identity are unknown in the supplied evidence; no IPv4 or IPv6 prefixes were observed in the combined routing snapshot. This is a snapshot result, not proof that the ASN is dormant or inactive. IANA records the ASN in the block assigned by ARIN, which identifies the allocating RIR but does not establish an individual assignment or current operator.
The combined observation covers route-views2 and route-views6 at 2026-11-06 20:00 UTC. It contains zero observed IPv4 prefixes, zero IPv6 prefixes, zero estimated IPv4 addresses, and zero AS_PATH neighbor observations. These values apply to the combined observation; they do not establish what either collector would show independently or what was visible at other times.
For triage, treat AS1581 as unidentified and without observed routes in this snapshot. If investigating a particular incident or address, compare its timestamp and origin against additional routing observations and authoritative registration records. The supplied evidence contains no operator-linked first-party material, products, website, or security findings, so it supports no claim about deployment, prevalence, reputation, or safety.
- Routing snapshot
- Zero IPv4 and IPv6 prefixes were observed in the combined route-views2 and route-views6 observation at 2026-11-06 20:00 UTC.
- Triage
- No AS_PATH neighbors were observed in that snapshot; this does not establish inactivity or provide a security assessment.
- Operator identity
- Unknown [Unknown] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
- ASN
- 1581 [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
- Allocating RIR
- ARIN [Confirmed] — https://www.iana.org/assignments/as-numbers/as-numbers-1.csv
- IPv4 prefixes
- 0 observed in the combined snapshot at 2026-11-06 20:00 UTC [Confirmed] — https://archive.routeviews.org/route-views2/bgpdata/2026.11/RIBS/rib.20261106.2000.bz2
- IPv6 prefixes
- 0 observed in the combined snapshot at 2026-11-06 20:00 UTC [Confirmed] — https://archive.routeviews.org/route-views6/bgpdata/2026.11/RIBS/rib.20261106.2000.bz2