DNS IN A records comparison !

id_viorel · 06-30-2008, 09:01 AM

Hello,

zone file configuration:

can u tell me what is the difference between these 3 :

host1.domain.com IN A "192.168.1.50"

and

host2.domain.com A "192.168.1.100"

and

host3.domain.com IN "192.168.1.150"

what is the diffrence between IN and A record ?
why should I use IN? helps me with what? becouse all of the above works?

thank u

dkm999 · 06-30-2008, 11:06 AM

The symbol IN stands for INternet, and is the only class of DNS record in widespread use today. Common members of this class of records are A, NS, CNAME, MX, and PTR. If you do not supply a class identifier in a DNS record, IN is assumed. And you do not need to quote the IP address string if you supply the A (record type) symbol.

chort · 06-30-2008, 03:22 PM

Always use IN A for clarity when specifying A records. Anyone who has to edit the zone later will thank you.

PS the quotes around the IP addresses are not necessary.

id_viorel · 07-01-2008, 04:03 AM

ok, thank u

I was confused becouse I saw more zone files configured with abbreviations, with IN, with A , with both and I didn't know WHAT'S THAT !

now it's clear... thanks