206208 looking glass

AS57728 CEZNET s.r.o. 🇨🇿 CZ

Announcing 8 prefixes, seen at the RIS collectors.

IPv4 prefixes
5
15,360 (60 × /24)
IPv6 prefixes
3
3 × /32
Upstreams
1
transit providers observed
Peers
0
settlement-free adjacencies
Downstreams
0
transit customers observed
Customer cone
0
ASes reachable through it

Registry and operator data

AS number
AS57728
Name
CEZNET s.r.o.
Organisation
HELIOS MB
Country
🇨🇿 CZ
RIR
RIPENCC
Allocated
2019-10-21
Scope
Not Disclosed
Peering policy
Open
PeeringDB
net/22675

RPKI coverage of this AS

Its own announcements, validated against the current ROA set

8 valid (100.0%) 0 invalid (0.0%) 0 no ROA (0.0%)

Whois

Fetched from whois.ripe.net

as-block:       AS57370 - AS57951
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2026-09-18T08:10:57Z
last-modified:  2026-09-18T08:10:57Z
source:         RIPE

aut-num:        AS57728
as-name:        CEZNET-AS
org:            ORG-TBS13-RIPE
remarks:        ---- NIX.CZ ----
import:         from AS47200 accept ANY
export:         to AS47200 announce AS-SET-HELIOSMB
remarks:        ---- PEERING.CZ ----
import:         from AS61195 accept ANY
export:         to AS61195 announce AS-SET-HELIOSMB
remarks:        ---- Telia ----
import:         from AS1299 accept ANY
export:         to AS1299 announce AS-SET-HELIOSMB
remarks:        ---- TPS ----
import:         from AS39791 accept ANY
export:         to AS39791 announce AS-SET-HELIOSMB
remarks:        ---- Superhosting.cz ----
import:         from AS39392 accept ANY
export:         to AS39392 announce AS-SET-HELIOSMB
remarks:        ---- Cerberos ----
import:         from AS42477 accept ANY
export:         to AS42477 announce AS-SET-HELIOSMB
remarks:        ---- 4NET ----
import:         from AS198346 accept AS198346
export:         to AS198346 announce AS-SET-HELIOSMB
remarks:        ---- CSC ----
import:         from AS62298 accept AS62298
export:         to AS62298 announce AS-SET-HELIOSMB
remarks:        ---- UPC ----
import:         from AS6830 accept ANY
export:         to AS6830 announce AS57728
admin-c:        CH13482-RIPE
tech-c:         CH13482-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         CEZNET-MNT
created:        2019-10-21T06:50:54Z
last-modified:  2025-09-26T09:55:20Z
source:         RIPE

organisation:   ORG-TBS13-RIPE
org-name:       CEZNET s.r.o.
country:        CZ
reg-nr:         26378191
org-type:       LIR
address:        Duhova 1531/3
address:        140 00
address:        Praha 4
address:        CZECH REPUBLIC
phone:          +420 211 046 699
admin-c:        CH13482-RIPE
tech-c:         CH13482-RIPE
abuse-c:        CH13482-RIPE
mnt-ref:        CEZNET-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         CEZNET-MNT
created:        2017-04-26T07:50:49Z
last-modified:  2026-05-13T07:38:07Z
source:         RIPE # Filtered

role:           CEZNET hostmaster
address:        CEZNET s.r.o.
address:        Vilemovska 1602
address:        Tachov
address:        347 01
address:        The Czech Republic
abuse-mailbox:  dohled@ceznet.cz
phone:          +420 211 046 699
admin-c:        MV6352-RIPE
tech-c:         KD4331-RIPE
tech-c:         MJ83172-RIPE
nic-hdl:        CH13482-RIPE
mnt-by:         CEZNET-MNT
created:        2024-01-12T08:23:53Z
last-modified:  2024-01-12T08:25:01Z
source:         RIPE # Filtered