Scott,
I use a security tool called Superscan (from
Foundstone).
It does reverse lookups, and if you just choose the
ping option only (not to scan)- it will provide the information you need (even
if pinging is blocked).
The newest version (4) doesn't support this feature.
Look online for the older version 3.
You can copy to the clipboard and use as
needed.
It is multi-threaded and fast. It can also do larger
than Class C networks (no limitation that I am aware of).
It is also free and small :)
Runs on M$.
Stan
Lyzak
BSEE, CISSP, MCSE�, CCNA,
Security+, A+
Network Security
Engineer
ASysTech,
Inc.
Scott,
I've been using a
tool called Angry IP Scanner. It sometimes dies on bad data being
returned, but otherwise it is a good tool for querrying large blocks of IP's
for reverse DNS entries. I would strongly suggest that you turn off the
port detection since it really doesn't give reliable results (based on how the
servers are configured).
Matt
Scott Fisher wrote:
I like to research a range of Reverse DNS
entries before potentially blocking a IP range.
I'm looking tool (an online one would be
fantastic) where I could type in a range say 209.200.18.0 (today's culprit)
and it would provide a list of Reverse DNS entries for 209.200.18.0 through
209.200.18.255.
This would be a time saver in creating my own
IP blacklists.
Any suggestions?
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