AS59959 — SFERIA SferiaNET.cz s.r.o.

Network type: residential

AS59959 announces 4 IPv4 prefixes covering 4,096 addresses and 1 IPv6 prefixes.

About this network

The AS handle SFERIA is held by SferiaNET.cz s.r.o.

What it's used for

• The address space carries residential and business internet access, evidenced by reverse DNS entries such as 0-157-3-185.advnet.cz and 255-93-35-193.advnet.cz.
• The network announces 4,096 IPv4 addresses across 4 prefixes and 1 IPv6 prefix, while maintaining 27 observed neighbours, indicating a role as a regional access provider with moderate peering.
• Traffic from this AS consists of subscriber eyeballs for cable and DSL services in the Czech Republic, as SferiaNET operates as a local ISP providing reliable internet and digital services.

Notable

• All four IPv4 prefixes are registered to SferiaNET.cz s.r.o. with netnames CZ-SFERIA-20120920, CZ-SFERIA-20160413, CZ-SFERIA-20180126, and CZ-SFERIA-20180911, confirming consistent ownership.
• The address inventory is composed of four /22 blocks, representing a finely subdivided corporate estate typical of a regional ISP managing distinct customer segments or geographic areas.

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

Announced prefixes

• 185.3.156.0/22
• 185.147.44.0/22
• 185.243.124.0/22
• 193.35.92.0/22
• 2a0d:1380::/29

Upstream networks

• AS39392 SH.cz s.r.o.
• AS6939 Hurricane Electric LLC
• AS24482 SG.GS
• AS37721 Virtual Technologies & Solutions
• AS29504 Freenet Liberec, z.s.
• AS20562 Broadband Hosting B.V.
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH

Adjacent networks

• AS39392 SH.cz s.r.o.
• AS6939 Hurricane Electric LLC
• AS37721 Virtual Technologies & Solutions
• AS29504 Freenet Liberec, z.s.
• AS24482 SG.GS
• AS20562 Broadband Hosting B.V.
• AS1764 Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH

Routing security

• RPKI: 2 valid, 0 invalid and 3 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 5 route objects.
• Listed in as-sets: AS59959:AS-SFERIA.

Internet exchanges

• Peering.cz — Prague, Czech Republic
• NIX.CZ - Neutral Internet eXchange for the Czech Republic — Prague, Czech Republic