Mobile carrier
AS5588 T-Mobile Czech Republic a.s.ASN lookup: IP ranges, prefixes and network type
AS5588 is the autonomous system number (ASN) announced by T-Mobile Czech Republic a.s.. It announces 61 prefixes, 104,448 IPv4 addresses in total. Every address inside those ranges is routed by this operator, which is what makes the number the shortest answer to who runs a given address.
AS5588 at a glance
| Organisation | T-Mobile Czech Republic a.s. |
|---|---|
| Autonomous system | AS5588 |
| Network type | Mobile carrier |
| IPv4 prefixes | 59 |
| IPv6 prefixes | 2 |
| IPv4 addresses | 104,448Summed across every announced prefix. IPv6 is not counted; the numbers are meaningless at that scale. |
| In known VPN ranges | 0 of 59 prefixes |
| In known datacenter ranges | 0 of 59 prefixes |
The last two rows are a second opinion, counted against the X4BNet VPN and datacenter range lists rather than read off the operator name. A network with most of its prefixes in the VPN list is carrying anonymised traffic whatever it calls itself.
Sample prefixes
The largest ranges T-Mobile Czech Republic a.s. announces, biggest first. These are a sample and not the full routing table: 61 prefixes do not fit on a page, and the ones worth showing are the ones most traffic comes from.
| Prefix | Family | Addresses |
|---|---|---|
| 91.120.192.0/19 | IPv4 | 8,192 |
| 194.149.0.0/19 | IPv4 | 8,192 |
| 195.56.32.0/19 | IPv4 | 8,192 |
| 195.56.160.0/19 | IPv4 | 8,192 |
| 195.56.224.0/19 | IPv4 | 8,192 |
| 91.120.0.0/20 | IPv4 | 4,096 |
| 91.120.224.0/20 | IPv4 | 4,096 |
| 195.56.16.0/20 | IPv4 | 4,096 |
| 195.56.80.0/20 | IPv4 | 4,096 |
| 195.56.144.0/20 | IPv4 | 4,096 |
| 195.56.208.0/20 | IPv4 | 4,096 |
| 91.120.48.0/21 | IPv4 | 2,048 |
Look up an address on AS5588
The field is prefilled with 91.120.192.1, the first address of the largest range above. Change it for one from your own logs and you get the network, the operator and the verdict for that specific address.
What AS5588 means for detection
Addresses on T-Mobile Czech Republic a.s. are mobile: phones and tablets behind carrier NAT. Our engine classifies them residential, with one caveat worth knowing. Carrier NAT puts thousands of subscribers behind one address, so an IP-level block here reaches far more people than intended, and rate limits keyed on the address will punish an entire city. Geolocation is coarse for the same reason.
The verdict for a single address is never settled by the ASN alone. It is the starting point, and IP Detection adds range membership, behaviour and history on top of it before it answers.
Related networks
The same page as JSON
No key and no signup. This is the endpoint this page is rendered from, so anything you read here you can script against.
curl https://ipscanner.io/v1/asn/directory/AS5588
IPScanner. AS5588 T-Mobile Czech Republic a.s., ASN directory. https://ipscanner.io/fr/asn/as5588. Derived from MaxMind GeoLite2.