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A PTR record is essentially the opposite of an A record. A records resolve names to IP addresses. PTR records resolve IP addresses to names.
A record = give me a name I'll give you an IP
PTR record = give me an IP I'll give you a name
Try it out in windows:
ping "www.Yahoo.com"
Here is what I got:
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F:\>ping www.yahoo.com
Pinging www-real.wa1.b.yahoo.com [69.147.76.15] with 32 bytes of data:
Reply from 69.147.76.15: bytes=32 time=14ms TTL=53
Reply from 69.147.76.15: bytes=32 time=11ms TTL=53
Reply from 69.147.76.15: bytes=32 time=65ms TTL=53
Reply from 69.147.76.15: bytes=32 time=12ms TTL=53
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now do a "ping -a IP-ADDRESS" which will spit you back the name attached to that IP
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F:\>ping -a 69.147.76.15
Pinging f1.www.vip.re1.yahoo.com [69.147.76.15] with 32 bytes of data:
Reply from 69.147.76.15: bytes=32 time=19ms TTL=53
Reply from 69.147.76.15: bytes=32 time=88ms TTL=53
Reply from 69.147.76.15: bytes=32 time=12ms TTL=53
Reply from 69.147.76.15: bytes=32 time=46ms TTL=53
Ping statistics for 69.147.76.15:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 12ms, Maximum = 88ms, Average = 41ms
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Your accessing PTR records to do this.
... and just so you beileve me try a "ping 69.147.76.15" and check the results
FYI: if your doing a ping -a to an intranet host you need to configure reverse lookup for it to work properly.
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∙ 14y ago
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