Strange trap - NetView for NT

["Chance, Larry" <lchance@SFBCIC.COM>]

Anyone know what this trap indicates or where it comes from?

I've gotten it a few times today already and it's my first time to
notice it.

Source: Netmon-Related
Enterprise: NetView
Severity: Warning
Category: Network Topology
Trap: 50462720

><WARNING: invalid SNMPTrap packet from agent 100.255.18.0 source A pid -1

Thanks very much.

Larry