Overview
Seznam.cz operates a platform network identified by AS43037.
The record includes 77.75.72.0/21 as a representative IPv4 prefix. It is not the network’s complete or permanent address space.
Current services include Search, portal, advertising, email, content, crawler, and platform infrastructure.
This record describes an autonomous system or publicly routed Internet network. It does not identify a physical Data Center, prove who operated an individual request, or establish that every address announced by the ASN is used for the same service.
Network prefixes
These are documented prefixes associated with this routed network. They are not necessarily the network’s complete current address space.
- Representative prefix
-
77.75.72.0/21
IPv4 · Active · RPKI Valid · checked 2026-08-06 - Associated prefix
-
2a02:598::/32
IPv6 · Active · RPKI Valid · checked 2026-08-06
Provider and network
- Network / Provider Name
- Seznam.cz
- Registered / Operating Organization
- Seznam.cz, a.s.
- ISP / Network Operator
- Seznam.cz, a.s.
- ASN
-
AS43037 - ASN Name
- SEZNAM-CZ
- Network Name
- SEZNAM-CZ
- Current Services
- Search, portal, advertising, email, content, crawler, and platform infrastructure
- Provider Type
- Search platform
- Network Type
- Search platform network
Network scope
- Registry Country
- CZ
Traffic and handling
- Traffic Classification
- Platform Network Traffic
- Traffic Label
- Platform Network
- Risk Level
- Low
- Recommended Action
- Log by default. Verify the claimed service or User-Agent and evaluate behavior before allowing, rate-limiting, or blocking.
- Default Rule Action
- Log
- Common Pattern
- Traffic may include public services, APIs, crawlers, preview fetchers, media delivery, and operator automation.
- Detection Notes
- Match AS43037 and representative CIDR 77.75.72.0/21, then verify the claimed Seznam service or crawler identity. The prefix is representative rather than exhaustive.