Autonomous system
AS187 DNSCAST-AS
Unclassified ARIN
Summary
DNScast
enterprise legacy
A low-numbered legacy allocation (DNSCAST-AS) now held by DNScast, a small DNS-focused network based in Berkeley, California.
What it's used for
- Operating DNS and related network services.
Notable
- Although currently registered to DNScast, the two-digit-adjacent AS number is an early-internet allocation from the number space's first years.
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
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS42 | WoodyNet, Inc. | 1,751 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, 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 · 4.61K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 4 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS187- Registry name
- DNSCAST-AS
- Registrant
- DNScast
- Abuse contact
- woody@pch.net
- Registered
- 2009-07-22
- Last changed
- 2012-03-20
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 34 valid, 0 with no ROA
- ROAs
- 4 authorising AS187
- ASPA
- no ASPA record
- IRR
- 100% registered · 34 of 34 announcements
- Route objects
- 38 naming AS187
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: 442 networks and 1,772 prefixes, as published 2026-10-15. 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