windows server 2003 - 5 IP Addresses on a multi-homed NIC, 4 ping-able, what's wrong with the 5th?

Dell Server, broadcom NIC, 5 IP addresses all on the same
subnet. Let's say 100.100.63.67-71. Windows Server
2003.

From another system on the 100.100.63.*
subnet, I can ping all IP addresses no
problem.

From a system on another subnet, say
100.100.58.*, I can ping all but one, the 100.100.63.70 address. It's in the middle of
the IP range.

In Win2003 server, I specify the
default gateway once as 100.100.63.1. Each individual IP has a subnet mask of
255.255.255.0. I've verified they are all the
same.

I'm stumped... why would 100.100.63.70 not
respond to pings from outside it's subnet, while the others
will?

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