AS43037 — SEZNAM-

Network type: hosting

AS43037 announces 2 IPv4 prefixes covering 3,072 addresses and 1 IPv6 prefixes.

About this network

The AS handle SEZNAM- is held by Seznam.cz, a.s.

What it's used for

• The address space carries infrastructure for a major Czech web portal and search engine, with netnames CZ-SEZNAM-20070507 and CZ-SEZNAM-20140808 registered to the company's IT department.
• The AS announces 3072 IPv4 addresses across 2 prefixes and 42 IPv6 prefixes, while maintaining 111 observed neighbours; this ratio of modest address inventory to high peering density indicates a content and service provider rather than a transit carrier.
• Traffic from this AS consists of web and API endpoints serving the Seznam.cz portal, search engine, and associated digital services to users in the Czech Republic and Europe.

Notable

• Registrants for both announced IPv4 prefixes are Seznam.cz, a.s., matching the AS holder and confirming direct ownership of the address space.
• The inventory includes a large IPv6 allocation under the 2a02:598::/47 block, subdivided into multiple prefixes, reflecting the company's dual-stack infrastructure for its web services.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 77.75.72.0/21
• 185.66.188.0/22
• 2a02:598::/32

Upstream networks

• AS5610 O2 Czech Republic, a.s.
• AS6939 Hurricane Electric LLC
• AS29208 Quantcom, a.s.
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS29504 Freenet Liberec, z.s.
• AS48362 Stadtwerke Feldkirch
• AS1836 green.ch AG
• AS34019 Hivane Association
• AS212024 Marc Schmitt
• AS29632 Netassist International EOOD
• AS12859 BIT BV
• AS37721 Virtual Technologies & Solutions
• AS12779 IT.Gate S.p.A.
• AS20485 Joint Stock Company TransTeleCom
• AS56662 Marcin Gondek
• AS37100 SEACOM Limited
• AS57463 NetIX Communications JSC
• AS47232 ISP Alliance a.s.
• AS213241 TECHIT.BE SRL
• AS17639 Converge ICT Solutions Inc.
• AS33891 Core-Backbone GmbH

Downstream networks

• AS200600 Seznam.cz datova centra, s.r.o.

Adjacent networks

• AS5610 O2 Czech Republic, a.s.
• AS6939 Hurricane Electric LLC
• AS200600 Seznam.cz datova centra, s.r.o.
• AS29208 Quantcom, a.s.
• AS34549 meerfarbig GmbH & Co. KG
• AS1836 green.ch AG
• AS48362 Stadtwerke Feldkirch
• AS34019 Hivane Association
• AS212024 Marc Schmitt
• AS29504 Freenet Liberec, z.s.
• AS24482 SG.GS
• AS29632 Netassist International EOOD
• AS12859 BIT BV
• AS37721 Virtual Technologies & Solutions
• AS17639 Converge ICT Solutions Inc.
• AS57463 NetIX Communications JSC
• AS47232 ISP Alliance a.s.
• AS213241 TECHIT.BE SRL
• AS37100 SEACOM Limited
• AS12779 IT.Gate S.p.A.
• AS20485 Joint Stock Company TransTeleCom
• AS56662 Marcin Gondek
• AS33891 Core-Backbone GmbH
• AS31027 GlobalConnect A/S

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic