domain IN-ARPA.ADDR

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1

I was trying to find a way to check whether an IP address is used by some
host without actually probing it. DNS sounds like a good way to go, but
I'v heard that domain "IN-ARPA.ADDR" is not well maintained and updated.

Is that true? If so, how un-dependable it could be?

Thanks a lot

Yixin Jin
UCLA, Computer Science Dept.

2

I was trying to find a way to check whether an IP address is used by some
host without actually probing it. DNS sounds like a good way to go, but
I'v heard that domain "IN-ARPA.ADDR" is not well maintained and updated.

Is that true? If so, how un-dependable it could be?

Very. Some ISP's don't maintain rDNS at all.