This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS210306 3 More Specifics 5 Total Advertisements ADVNET, CZ
185.3.156.0/23 185.3.156.0/22
185.3.158.0/24 185.3.156.0/22
185.3.159.0/24 185.3.156.0/22
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 185.3.156.0/22 Announced
whois: 402590
IANA has recorded AS210306 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS210306\n % This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html
% Note: this output has been filtered.
% Information related to 'AS208189 - AS214345'
as-block: AS208189 - AS214345
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: 2026-02-12T14:40:05Z
last-modified: 2026-02-12T14:40:05Z
source: RIPE
% Information related to 'AS210306'
% Abuse contact for 'AS210306' is 'abuse@sferia.cz'
aut-num: AS210306
as-name: ADVNET
org: ORG-SS821-RIPE
import: from AS209810 accept ANY
export: to AS209810 announce AS210306
import: from AS16246 accept ANY
export: to AS16246 announce AS210306
admin-c: SFER1-RIPE
tech-c: SFER1-RIPE
status: ASSIGNED
mnt-by: RIPE-NCC-END-MNT
mnt-by: cz-sferia-MK-mnt
created: 2018-08-29T13:27:53Z
last-modified: 2024-03-26T15:01:13Z
source: RIPE
organisation: ORG-SS821-RIPE
org-name: SferiaNET.cz s.r.o.
country: CZ
reg-nr: 27276864
org-type: LIR
address: Riegrova 4338/12
address: 466 01
address: Jablonec nad Nisou
address: CZECH REPUBLIC
phone: +420 488 723 101
admin-c: PP16696-RIPE
tech-c: PP16696-RIPE
tech-c: MP13836-RIPE
abuse-c: AR44870-RIPE
mnt-by: RIPE-NCC-HM-MNT
mnt-by: cz-sferia-MK-mnt
created: 2018-01-26T09:03:45Z
last-modified: 2026-05-13T07:38:51Z
source: RIPE # Filtered
mnt-ref: cz-sferia-MK-mnt
%ERROR:201: access denied for 2401:2000:6660:0:0:0:0:13
%
% Queries from your IP address have passed the daily limit of controlled objects.
% Access from your host has been temporarily denied.
% For more information, see
% https://docs.db.ripe.net/FAQ#why-did-i-receive-an-error-201-access-denied
% This query was served by the RIPE Database Query Service version 1.122.1 (SHETLAND)