Autonomous System

AS2850 University College Dublin

EducationActiveIrelandRIPE

AS2850 (University-College-Dublin) is an education network operated by University College Dublin in Ireland, registered with RIPE. It has 1 IPv4 prefix with 65,536 addresses, which makes it the 3,561st largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses65,536in 1 prefix
IPv6 prefixes0none
Size rank#3,561of 82,200 active ASNs
Abuser scoreVery Low0.01% of its addresses flagged · method

Details

OrganizationUniversity College Dublin
AS nameUniversity-College-Dublin
Websiteucd.ie
Country Ireland (IE)
Network typeEducation
RegistryRIPE
Abuse contactsecurity@ucd.ie
Registered1970-01-01
Last updated2026-05-13

IPv4 prefixes

1 prefix · 65,536 addresses
NetworkAddressesFirst – last address
137.43.0.0/1665,536137.43.0.0 – 137.43.255.255

IPv6 prefixes

No IPv6 prefixes.

Query AS2850 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS2850&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS2850, with or without a key:

curl "https://api.ipapi.is/?q=137.43.0.1"

Largest networks in Ireland

AS1213 ASIERA TECHNOLOGY SERVICES CLG1,843,200 IPv4 addressesAS5466 Eircom Limited1,110,784 IPv4 addressesAS15502 Vodafone Ireland Limited943,104 IPv4 addressesAS43515 Google Ireland Limited269,056 IPv4 addressesAS2110 Enet Communications LIMITED246,528 IPv4 addressesAS13280 Three Ireland (Hutchison) limited225,280 IPv4 addresses