AS199711 — NCISA-AS National Cyber and Information Security Agency

AS199711 announces 2 IPv4 prefixes covering 768 addresses and 1 IPv6 prefixes.

About this network

NCISA-AS is operated by the National Cyber and Information Security Agency.

What it's used for

• The address space carries agency infrastructure, identified by netnames NUKIB-BRNO and NUKIB-PRAHA associated with the agency's Brno and Prague locations.
• The AS announces 768 IPv4 addresses across 2 prefixes and 1 IPv6 prefix, with only 2 observed neighbours, indicating a small, self-contained government network rather than a transit or access provider.
• Traffic from this AS consists of internal agency communications and cybersecurity operations for the Czech Republic's national cyber defense.

Notable

• Registrants for both announced prefixes are NCISA Admins; National Cyber and Information Security Agency, fully consistent with the AS holder.
• The address inventory is finely subdivided into two distinct prefixes corresponding to specific geographic sites (Brno and Prague), reflecting a segmented internal corporate estate.

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

Announced prefixes

• 185.48.21.0/24
• 185.48.22.0/23
• 2a01:95a0::/32

Upstream networks

• AS2852 CESNET z.s.p.o.
• AS15935 ha-vel internet s.r.o.

Adjacent networks

• AS2852 CESNET z.s.p.o.
• AS15935 ha-vel internet s.r.o.

Routing security

• RPKI: 4 valid, 0 invalid and 0 not-found announcements; 2 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 8 route objects.
• Listed in as-sets: AS-GTSCZ-CUST, AS-HA-VEL-TRANSITCUST, AS-HURRICANEV6, AS-RETN-ACTUAL-V4, AS2852:AS-CESNET, AS2852:AS-CESNET-NIX-FENIX.