Autonomous system
AS4373 OCLC-AS - Online Computer Library Center
Unclassified APNIC
Summary
OCLC (Online Computer Library Center)
enterprise legacy
OCLC-AS is the network of OCLC, the Online Computer Library Center — a nonprofit library cooperative based in Dublin, Ohio, best known for running the WorldCat union catalog.
What it's used for
- Delivering OCLC's library technology services to member libraries worldwide: cataloging, resource sharing, and WorldCat lookups.
- Corporate and data-centre networking for OCLC's own operations from its Dublin, Ohio campus.
Notable
- Institutional address space: an IP here belongs to a nonprofit membership organisation serving libraries, not to a residential subscriber or a commercial host renting capacity.
- The allocation is sizeable — tens of thousands of IPv4 addresses — which is a legacy of an early-1995 ARIN registration made when address space was handed out generously to established institutions.
Interesting
- OCLC sits in an unusual middle ground: not a university, not a commercial ISP, but a library-sector cooperative whose services quietly sit behind catalog lookups at thousands of academic and public libraries.
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
6 upstream, 0 downstream and 6 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 16 prefixes · 72.70K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 16 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS4373- Registry name
- OCLC-AS
- Registrant
- Online Computer Library Center
- Abuse contact
- noc@ans.net
- Registered
- 1995-02-08
- Last changed
- 1995-02-08
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 19 with no ROA
- ROAs
- 0 authorising AS4373
- ASPA
- no ASPA record
- IRR
- 100% registered · 19 of 19 announcements
- Route objects
- 39 naming AS4373
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: 454 networks and 1,847 prefixes, as published 2026-11-11. 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