Autonomous system
AS8251 NFX_ZSPO
Hosting RIPE NCC Non-Profit
Summary
NFX z.s.p.o. / FreeTel
isp legacy
NFX_ZSPO 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.netanddhcp.pilsfree.net(PilsFree, Plzeň),78-108-100-NN.czela.net(CZELA.net, Čelákovice), andNN.nat.hutisko.hvfree.net. - Names like
rodova-vila-nat.pilsfree.netand 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| NIX.CZ - Neutral Internet eXchange for the Czech Republic | Prague, Czech Republic | 91.210.16.73 |
Transit providers
7 upstream, 16 downstream and 42 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 17.41K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 6 |
Registry
Allocation record
- Registry
- RIPE NCC
- Registered
- 2006-07-17
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- NFX, z.s.p.o. (FreeTel, s.r.o.)
- Also known as
- FreeTel s.r.o.
- Network type
- Non-Profit
- Scope
- Regional
- Traffic ratio
- Mostly Inbound
- Peering policy
- Open
- IRR as-set
AS-NFX-NIX- Present at
- 1 exchanges
- Facilities
- 3 facilities
- Website
- http://www.nfx.cz
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 7 valid, 0 with no ROA
- ROAs
- 8 authorising AS8251
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 11 naming AS8251
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,775 prefixes, as published 2026-10-11. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere