De acordo com essas consultas, ele provavelmente não configurou o nome de domínio nos servidores de nomes autorizados para esse domínio:
C:\Users\plenderj>nslookup
Default Server: ie-dub01a-dns01.upc.ie
Address: 89.101.160.4
> set q=ns
> safar724.ir
Server: ie-dub01a-dns01.upc.ie
Address: 89.101.160.4
Non-authoritative answer:
safar724.ir nameserver = ikjot.ekkum.com
safar724.ir nameserver = ikdev.ekkum.com
safar724.ir nameserver = ns1.ekkum.com
safar724.ir nameserver = iknoor.ekkum.com
safar724.ir nameserver = ikdesh.ekkum.com
ikdesh.ekkum.com internet address = 199.26.68.157
ns1.ekkum.com internet address = 199.26.68.2
iknoor.ekkum.com internet address = 24.114.243.251
ikdev.ekkum.com internet address = 64.72.239.182
ikjot.ekkum.com internet address = 208.124.160.124
> set q=a
> ns1.safar724.ir
Server: ie-dub01a-dns01.upc.ie
Address: 89.101.160.4
*** ie-dub01a-dns01.upc.ie can't find ns1.safar724.ir: Non-existent domain
>
Ele provavelmente precisaria gerenciar seu domínio no ekkum.com