Autonomous system
AS11661 SEMICUBIC
Unclassified ARIN
Summary
Semicubic Systems LLC
hosting legacy
SEMICUBIC belongs to Semicubic Systems LLC, a small independent network operator registered in Henderson, Nevada and physically present in the San Francisco Bay Area. Despite the low AS number, ARIN registered this ASN in February 2020 — it is a recycled number, not an early-internet network.
What it's used for
Infrastructure rather than eyeballs. The AS announces two v4 prefixes (162.248.172.0/22 and 23.152.112.0/24, 1,280 addresses in total) plus a single IPv6 /44, and RIS sees it with four neighbours. PeeringDB lists it at the Fremont Cabal Internet Exchange on a 10G port, with equipment at Hurricane Electric's Fremont 2 facility and an open peering policy. A colo footprint, an IXP port and an IPv6 allocation far larger than the v4 holding is the shape of a network built to host and originate services, not to serve subscribers. What exactly it carries is not directly observable from the routing data, so treat the specific workload as unconfirmed.
Notable
Both prefixes are registered in ARIN directly to Semicubic Systems LLC, and everything sits in one RIR. That matters: the leased-address and residential-proxy pattern shows up as scattered blocks registered to several unrelated third parties, and none of that is present here. Self-registered space announced by its own holder is the signature of a real operator, however small.
Interesting
The four-neighbour count places it firmly in the customer, not carrier, tier — an open-peering member of a community exchange rather than a transit seller.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Fremont Cabal Internet Exchange | Fremont, United States | 206.80.238.62 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-12, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 1.28K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 3 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11661- Registry name
- SEMICUBIC
- Registrant
- Semicubic Systems LLC
- Abuse contact
- arin-abuse@semicubic.com
- Registered
- 2020-02-04
- Last changed
- 2020-02-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 4 authorising AS11661
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 4 naming AS11661
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 436 networks and 1,769 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere