AS57728 is the autonomous system of CEZNET s.r.o.. It holds 15,360 IPv4 addresses in 4 prefixes plus 3 IPv6 ranges, mainly in 
Czechia.
By IPv4 addresses the network ranks #7,274 worldwide and #45 of 562 networks in Czechia. That is 0.18% of the country’s IPv4 space.
The largest block is 188.122.192.0 to 188.122.223.255 with 8,192 addresses, geolocated to Hradec Králové.
- IPv4 addresses
- 15,360
- IPv4 prefixes
- 4
- World rank
- #7,274
- Country share
- 0.18%
- IPv6 ranges
- 3
Addresses by country
- Czechia 100%
Largest blocks
- 188.122.192.0 Hradec Králové8,192
- 81.25.16.0 Prague4,096
- 109.234.40.0 Prague2,048
- 185.255.116.0 Prague1,024
Networks of similar size
- AS29667 Atlantis Net Ltd.
15,360 - AS29321 O2 Czech Republic, a.s.15,360
- AS49826 Lounea Palvelut Oy
15,360 - AS16083 StackNet Service, LLC
15,360 - AS198541 INTERCOMTEL Limited Company15,360
- AS35506 INFORMATION SOCIETY S.A.
15,360 - AS20533 PJSC "Vimpelcom"15,360
- AS30892 DEUTSCHE TELEKOM GLOBAL BUSINESS SOLUTIONS IBERIA SL
15,360
IPv4 prefixes
Questions and answers
Who owns AS57728?
Autonomous system AS57728 is operated by CEZNET s.r.o..
How many IP addresses does AS57728 have?
The network holds 15,360 IPv4 addresses in 4 prefixes, plus 3 IPv6 ranges.
Which country is AS57728 in?
The main country is Czechia.
How big is AS57728?
By IPv4 addresses it ranks #7,274 worldwide.
What is the largest address block of AS57728?
188.122.192.0 to 188.122.223.255, 8,192 addresses.