Registered organisation
CESNET z.s.p.o.
Address space registered to CESNET z.s.p.o., and where it is announced from.
Registered holders come from the bulk whois that RIPE, APNIC and AFRINIC publish. ARIN and LACNIC do not publish theirs, so space held in North and South America is largely unattributed here.
What this tells you
- Holds 25,813 IPv4 addresses and 34,351,120,250 IPv6 /64 networks across 274 registered blocks.
- Announced entirely by AS2852 CESNET z.s.p.o..
- All of the space we can place resolves to Czechia.
Networks announcing this space
Space announced by a network covers 100% of this holder's IPv4 space and 100% of its IPv6 space. The table below divides that space.
| Network | IPv4 share | IPv6 share | |
|---|---|---|---|
| AS2852 CESNET z.s.p.o. | 100% | 100% |
Countries this space resolves to
Space we can place in a country covers 100% of this holder's IPv4 space and 100% of its IPv6 space. The table below divides that space.
| Country | IPv4 share | IPv6 share | |
|---|---|---|---|
| Czechia | 100% | 100% |
An operator of the same name runs networks of its own: see CESNET z.s.p.o. for the networks side of the same company.
Holding a block is a registry fact, not a physical one. The organisation named here is who the block is assigned to, which is often a customer of the network operator announcing it.
Every figure on this page is also JSON: /api/v2/directory/org/cesnet-z-s-p-o. Breakdowns paginate from there, so a table showing the largest rows here returns all of them. Read the API.