O2 Czech Republic · Czech Republic
O2 Czech Republic is a mobile network operator in the Czech Republic and part of PPF Group. The registry records AS5610 as the ASN carrying its mobile network, alongside four ASNs held for fixed-line operations. Its mobile country and network codes are 230-02, 230-04 and 230-22. It runs 4G LTE and 5G.
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.
| ASN | Holder (RIPEstat) | Role | Announced | IPv4 / IPv6 prefixes | Evidence |
|---|---|---|---|---|---|
| AS5610 | O2-CZECH-REPUBLIC O2 Czech Republic, a.s. | Mobile network confirmed | yes | 67 / 5 | source · RIPEstat |
| AS12570 | ITSELF O2 Czech Republic, a.s. PeeringDB: itself s.r.o. · NSP | Fixed-line confirmed | yes | 11 / 2 | source · RIPEstat · PeeringDB |
| AS16246 | AS16246 O2 Czech Republic, a.s. PeeringDB: Nej.cz s.r.o. · Cable/DSL/ISP | Fixed-line confirmed | yes | 13 / 2 | source · RIPEstat · PeeringDB |
| AS20884 | CZ-CTNET-AS O2 Czech Republic, a.s. | Fixed-line confirmed | no | 0 / 0 | source · RIPEstat |
| AS25036 | TERMSNET-AS O2 Czech Republic, a.s. | Fixed-line confirmed | no | 0 / 0 | source · RIPEstat |
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 O2 Czech Republic
The registry lists five ASNs held by O2 Czech Republic. AS5610 is recorded as the mobile-carrying ASN, and at the last probe it announced 67 IPv4 prefixes against 5 IPv6 prefixes. PeeringDB lists it under the operator's own name with a cable and DSL ISP information type and no separate mobile label. AS12570 announced 11 IPv4 and 2 IPv6 prefixes and appears in PeeringDB as itself s.r.o., an NSP; AS16246 announced 13 IPv4 and 2 IPv6 prefixes and appears as Nej.cz s.r.o., a cable and DSL ISP. AS20884 and AS25036 announced nothing.
An address whose origin ASN is AS5610 is routed by O2 Czech Republic, and the registry marks that ASN as the one carrying mobile traffic, so mobile is the likeliest reading for it. The other announced ASNs, AS12570 and AS16246, are recorded as fixed-line, and PeeringDB describes them as ISP networks, so an address originating there is more likely a home or business connection than a handset. AS20884 and AS25036 announce no prefixes, so no live address maps to them. The origin ASN alone does not confirm which access technology a given address sits on.
Research note. AS5610 is the primary O2 CZ network per PeeringDB (name 'O2 Czech Republic', website o2.cz, info_type Cable/DSL/ISP, traffic 1-5Tbps, IRR RIPE::AS-CTIOL); RIPEstat holder O2-CZECH-REPUBLIC, announced. PeeringDB does not separately label it mobile; RIPE whois shows a general ISP/transit AS carrying many business customers, so the consumer mobile network is assumed to sit on AS5610 as the only large announced O2 AS. RIPEstat holder 'O2 Czech Republic, a.s.' also for 12570 (ITSELF, announced, acquired ISP), 16246 (whois descr NEJ.cz s.r.o., announced, acquired cable ISP), 20884 (CZ-CTNET-AS, not announced), 25036 (TERMSNET, not announced) plus other acquired-ISP ASNs in the candidate list (29321, 31246, 35214, 41046, 41824, 42908, 44070, 47681, 49767, 61169, 202522) which were not individually fetched and are omitted. MNC 230-04 is Nordic Telecom (operator O2 Czech Republic, LTE 410 public safety) and 230-22 is listed as O2 with unknown status; 230-02 is the consumer network (LTE 800/900/1800/2600, 5G 1800/2100/3700). Parent: 'Člen skupiny PPF' on spolecnost.o2.cz. 5G: o2.cz states 97% population can connect to 5G; SIM with 4G LTE (USIM) suffices.
Checking whether an IP belongs to O2 Czech Republic
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 AS5610' | grep ^routeQuestions
What is O2 Czech Republic's ASN?
The registry records five ASNs for O2 Czech Republic. AS5610 is the one it marks as carrying the mobile network. AS12570 and AS16246 are announced fixed-line ASNs, while AS20884 and AS25036 are held by the operator but announce no prefixes.
What is the MCC/MNC of O2 Czech Republic?
The registry lists three rows under mobile country code 230, with MNCs 02, 04 and 22. MNC 02 is the consumer network. MNC 04 is the LTE 410 public safety network operated by O2, and MNC 22 is recorded under O2 with its status not documented.
Is an IP from AS5610 a mobile IP?
AS5610 is the ASN the registry records as carrying O2 Czech Republic's mobile network, so an address originating there is routed by the operator and is likely mobile. PeeringDB does not label the ASN as mobile-only, and the same number carries other O2 customer traffic, so the ASN by itself is not proof.
Sources
- https://www.peeringdb.com/api/net?asn=5610
- https://stat.ripe.net/data/as-overview/data.json?resource=AS5610
- https://stat.ripe.net/data/whois/data.json?resource=AS5610
- https://stat.ripe.net/data/as-overview/data.json?resource=AS20884
- https://stat.ripe.net/data/whois/data.json?resource=AS20884
- https://stat.ripe.net/data/as-overview/data.json?resource=AS12570
- https://stat.ripe.net/data/whois/data.json?resource=AS12570
- https://stat.ripe.net/data/as-overview/data.json?resource=AS16246
- https://stat.ripe.net/data/whois/data.json?resource=AS16246
- https://stat.ripe.net/data/as-overview/data.json?resource=AS25036
- https://stat.ripe.net/data/whois/data.json?resource=AS25036
- https://spolecnost.o2.cz/o-spolecnosti
- https://www.o2.cz/osobni/volani/nase-sit
- https://en.wikipedia.org/wiki/Mobile_Network_Codes_in_ITU_region_2xx_(Europe)
- RIPEstat Data API (holder, announced prefixes)
- PeeringDB API (network records)