This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
whois: 402603
IANA has recorded AS1903 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS1903\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 'AS1877 - AS1903'
as-block: AS1877 - AS1903
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: 2018-11-22T15:27:14Z
last-modified: 2018-11-22T15:27:14Z
source: RIPE
% Information related to 'AS1903'
% No abuse contact registered for AS1903
aut-num: AS1903
as-name: GTSCZ-TRANSIT
descr: GTS Czech Republic Transit AS
admin-c: MK845-RIPE
admin-c: MK845-RIPE
admin-c: MM70-RIPE
tech-c: GTSC1-RIPE
status: LEGACY
mnt-by: GTSCZ-A-MNT
created: 2002-09-10T16:09:40Z
last-modified: 2017-08-09T11:36:49Z
source: RIPE # Filtered
%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 (DEXTER)