Eir · Ireland
Eir is a mobile and fixed network operator in Ireland, recorded here under the NJJ (Xavier Niel) / Iliad group. Its mobile network runs on AS15751, registered to Eircom Limited as METEORMOBILECOMMS-AS, while AS5466 carries fixed service. The registry lists MCC/MNC codes 272-03, 272-07 and 272-08, and 4G LTE and 5G generations.
Autonomous systems
Holder names and prefix counts come from the RIPE NCC's RIPEstat Data API, fetched on 2026-09-06. Role and confidence come from the evidence linked in each row; "confirmed" means a PeeringDB or RIPEstat record, or the operator's own site, names the operator.
Mobile network codes
The MCC identifies the country and the MNC identifies the operator inside it. Together they appear in the IMSI of every SIM on the network and in device diagnostics; they are how a handset knows which network it is on.
About Eir
The registry records two ASNs for Eir, both registered to Eircom Limited. AS15751, the mobile AS, announced 7 IPv4 prefixes and 1 IPv6 prefix at the last probe. AS5466, the fixed AS under the EIRCOM holder name, announced 25 IPv4 prefixes and 3 IPv6 prefixes at the last probe. PeeringDB has no entry for AS15751. The PeeringDB entry behind AS5466 names eircom as a fixed and mobile broadband ISP and attributes mobile broadband to AS15751.
An address whose origin ASN is AS15751 or AS5466 is routed by Eir. The two differ in what they tell you: AS15751 is the documented mobile AS, so an address originating there sits on the mobile network, while AS5466 is documented as fixed and an address there is more likely a home or business broadband line. Eir announces far more IPv4 space on the fixed AS than on the mobile one, so origin ASN, not the Eir name, is what separates the two.
Research note. No RIPE asn.txt candidates were supplied; ASNs found via PeeringDB. AS5466: RIPEstat holder 'EIRCOM Eircom Limited', announced; PeeringDB net 'eircom' (aka 'eir is a trading name of eircom Limited', website eir.ie, Cable/DSL/ISP, 1-5Tbps) whose notes read 'Fixed (AS5466) & Mobile broadband (AS15751) ISP'. AS15751: RIPEstat holder 'METEORMOBILECOMMS-AS Eircom Limited', announced - the mobile (ex-Meteor) AS; no PeeringDB entity (404). AS2110 checked and rejected: holder is Enet Communications (ex Esat/BT Ireland), not eir. MCC/MNC per Wikipedia: 272-03 Operational (former Meteor; GSM 900, UMTS 900/2100, LTE 800/1800/2100, 5G 1800/3500), 272-07 Operational (former eMobile; GSM 900/UMTS 2100), 272-08 held by Eir with status Unknown. Generations: eir press release states '5G network is now available to more than 70% of the population' and '4G network which is available to more than 99% of the geography of Ireland'; May 2026 release says 3G retirement from 1 Oct 'will support continued development of 4G and 5G services'. Ownership: eir.ie footer says 'eir and open eir are trading names of eircom Limited'; Irish Times (2025-03-16) states 'NJJ Boru, a company controlled by Mr Niel and his company Iliad, now owns more than 70 per cent of Eir with US private equity firm Anchorage Capital'. Operator site does not itself name the parent.
Checking whether an IP belongs to Eir
Look up the origin ASN of the address and compare it with the table above. RIPEstat answers for any address, and the RADB whois mirror lists the routes registered under an ASN.
curl -s "https://stat.ripe.net/data/prefix-overview/data.json?resource=203.0.113.9" | jq '.data.asns'whois -h whois.radb.net -- '-i origin AS15751' | grep ^routeQuestions
What is Eir's ASN?
The registry records two: AS15751, registered as METEORMOBILECOMMS-AS to Eircom Limited, carries the mobile network, and AS5466, registered as EIRCOM to the same company, carries fixed service. Both announced prefixes at the last probe.
What is the MCC/MNC of Eir?
The registry lists three codes for Eir under mobile country code 272: 272-03, 272-07 and 272-08. All three are recorded against the operator, and the registry does not rank one as primary.
Is an IP from AS15751 a mobile IP?
AS15751 is documented as Eir's mobile AS, so an address originating there is routed on the mobile network rather than the fixed one. The registry does not record which prefixes within it are handset traffic and which serve other uses.
Sources
- https://stat.ripe.net/data/as-overview/data.json?resource=AS15751
- https://stat.ripe.net/data/as-overview/data.json?resource=AS5466
- https://www.peeringdb.com/api/net?asn=5466
- https://en.wikipedia.org/wiki/Mobile_network_codes_in_ITU_region_2xx_(Europe)
- https://www.eir.ie/pressroom/eirs-5G-network-now-available-to-more-than-70-of-people-in-Ireland/
- https://www.eir.ie/pressroom/eir-to-begin-retiring-3G-network-from-October-1st/
- https://www.eir.ie/pressroom/
- https://www.irishtimes.com/business/2025/03/16/french-billionaire-niel-inches-closer-to-full-ownership-of-eir/
- RIPEstat Data API (holder, announced prefixes)
- PeeringDB API (network records)