centos.org のドメインとんどる？

% host -r -t soa centos.org TLD2.ULTRADNS.NET.
Using domain server:
Name: TLD2.ULTRADNS.NET.
Address: 204.74.113.1#53
Aliases:

centos.org has no SOA record
% host -r -t soa centos.org A0.ORG.AFILIAS-NST.INFO.
Using domain server:
Name: A0.ORG.AFILIAS-NST.INFO.
Address: 199.19.56.1#53
Aliases:

centos.org has no SOA record
% host -r -t soa centos.org B0.ORG.AFILIAS-NST.org.
Using domain server:
Name: B0.ORG.AFILIAS-NST.org.
Address: 199.19.54.1#53
Aliases:

centos.org has no SOA record