Autonomous system
AS6881 NIXCZ NIX.CZ z.s.p.o.
Unclassified RIPE
Summary
NIX.CZ (Neutral Internet eXchange of the Czech Republic)
ixp legacy
NIXCZ is the autonomous system of NIX.CZ z.s.p.o., the neutral internet exchange point of the Czech Republic, based in Prague.
What it's used for
- Operating the exchange's own infrastructure: route servers, management and monitoring systems, and the association's public-facing services. Reverse DNS on the announced space resolves under
nix.cz. - The exchange itself is a layer-2 fabric. Traffic between members crosses the IXP without transiting this ASN, so the AS number is not a good proxy for the volume of traffic NIX.CZ actually carries.
Notable
- An IXP does not fit the usual hosting/ISP/enterprise buckets. It is neutral interconnection infrastructure, and its address space exists mostly to number peering LANs and support systems rather than to serve end users or customers.
- NIX.CZ is a membership association (
z.s.p.o.is the Czech legal form for an association of legal entities), not a commercial carrier.
Interesting
- Alongside the peering fabric, NIX.CZ has run national initiatives such as anti-DDoS protection and secure networking services for critical Czech infrastructure, which is a broader remit than most exchanges take on.
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 | 91.210.16.245 |
Transit providers
7 upstream, 4 downstream and 19 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 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 2.30K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CZ | Czechia | 3 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS6881- Registry name
- NIXCZ
- Registrant
- AS6881-MNT
- Abuse contact
- abuse@nix.cz
- Registered
- 2002-05-17
- Last changed
- 2026-03-02
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 50% valid · 3 valid, 0 with no ROA 3 RPKI-invalid
- ROAs
- 11 authorising AS6881
- ASPA
- 4 declared providers
- IRR
- 100% registered · 6 of 6 announcements
- Route objects
- 6 naming AS6881
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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: 436 networks and 1,771 prefixes, as published 2026-10-13. 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