SOA
Start of Authority
Primary NS
Mailbox
hostmaster.iotviet.com
Serial
2021012200
Refresh
14400
Retry
3600
Expire
1209600
Minimum TTL
86400
NS
Nameservers
MX
Mail Exchangers
TXT
TXT Records
MS=B1911E629D6F924BA1D338C415F669EB7F39F226
v=spf1 include:_spf.google.com ~all
A