AS8251 — NFX_ZSPO

Network type: hosting

AS8251 announces 5 IPv4 prefixes covering 17,408 addresses and 1 IPv6 prefixes.

About this network

NFXZSPO is NFX, z.s.p.o. — a Czech zájmové sdružení právnických osob, an association of legal entities — operated together with FreeTel, s.r.o. It exists to give the country's community "free net" networks shared upstream transit and peering at NIX.CZ in Prague.

What it's used for

• Around 17,400 addresses in six prefixes, plus IPv6, and transit for roughly sixteen downstream member ASNs.
• The reverse DNS is the giveaway: the space is filled with the member community networks' subscriber routers — router.NAME.klfree.cz (KLFree, Kladno), NAME.pilsfree.net and dhcp.pilsfree.net (PilsFree, Plzeň), 78-108-100-NN.czela.net (CZELA.net, Čelákovice), and NN.nat.hutisko.hvfree.net.
• Names like rodova-vila-nat.pilsfree.net and per-member router hostnames are exactly what a member-run residential network looks like: households and small NAT gateways, not datacentre or corporate assignments.

Notable

• The addresses land in homes, even though the AS holder is an association rather than a retail ISP. Czech community networks are member-owned cooperatives, and the AS is their shared route to the internet.
• A handful of infrastructure and service hosts share the space (speed.nfx.cz, an IPTV provider), so it is not exclusively subscriber addressing.

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

Announced prefixes

• 31.47.96.0/20
• 78.108.96.0/20
• 81.201.48.0/20
• 185.99.64.0/22
• 212.79.96.0/20
• 2a01:490::/32

Upstream networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS29208 Quantcom, a.s.
• AS16019 Vodafone Czech Republic a.s.
• AS24482 SG.GS
• AS29504 Freenet Liberec, z.s.
• AS57463 NetIX Communications JSC
• AS202297 Skylon Solutions Limited

Downstream networks

• AS57707 Greendata s.r.o.
• AS34596 HVfree.net servis. s.r.o.
• AS201608 HovNet-SERVIS s.r.o.
• AS198813 SychrovNET s.r.o
• AS198977 UnArtel s.r.o.
• AS49095 PRAHA12.com s.r.o.
• AS41670 hkfree.org z.s.
• AS59984 KLFREE NETWORKS, s.r.o.
• AS12984 PilsFree, z. s.
• AS214224 CeskaSit.net Networks s.r.o.
• AS51400 SPOJE.NET s.r.o.
• AS51331 SychrovNET s.r.o
• AS196843 KHnet.info, z.s.
• AS62099 JM-Networks, s.r.o.
• AS31349 a-net Liberec s.r.o.
• AS59747 NIX.CZ z.s.p.o.

Adjacent networks

• AS1299 Arelion Sweden AB
• AS49095 PRAHA12.com s.r.o.
• AS6939 Hurricane Electric LLC
• AS57707 Greendata s.r.o.
• AS29208 Quantcom, a.s.
• AS198813 SychrovNET s.r.o
• AS201608 HovNet-SERVIS s.r.o.
• AS34596 HVfree.net servis. s.r.o.
• AS12984 PilsFree, z. s.
• AS198977 UnArtel s.r.o.
• AS41670 hkfree.org z.s.
• AS16019 Vodafone Czech Republic a.s.
• AS59984 KLFREE NETWORKS, s.r.o.
• AS214224 CeskaSit.net Networks s.r.o.
• AS29504 Freenet Liberec, z.s.
• AS24482 SG.GS
• AS51400 SPOJE.NET s.r.o.
• AS202297 Skylon Solutions Limited
• AS57463 NetIX Communications JSC
• AS51331 SychrovNET s.r.o
• AS196843 KHnet.info, z.s.
• AS62099 JM-Networks, s.r.o.
• AS59747 NIX.CZ z.s.p.o.
• AS31349 a-net Liberec s.r.o.
• AS8218 Zayo Infrastructure France SA

Internet exchanges

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