It can be anything! An apex, subdomain, or even a URL.

Results forstdw.pl

Registrar

Creation Date

DNSSEC

DNSalt+1
DNS Mapalt+2
Whoisalt+3
Certsalt+4
Subdomainsalt+5

whois.dns.pl

DOMAIN NAME:                    stdw.pl
registrant type:                individual
nameservers:                    lady.ns.cloudflare.com. 
                                tim.ns.cloudflare.com. 
created:                        2021.10.21 20:22:07
last modified:                  2023.01.02 10:20:31
renewal date:                   2032.10.21 20:22:07

option:                         no

dnssec:                         Unsigned

REGISTRAR:
team.blue Denmark A/S (secondary name: Simply.com A/S)
Højvangen 4
DK-8660 Skanderborg
Dania/Denmark
Tel: +45.86515030
https://www.simply.com/pl/support/

WHOIS database responses:       https://dns.pl/en/whois

WHOIS displays data with a delay not exceeding 15 minutes in relation to the .pl Registry system