Freeware. Get ENUM NAPTR mapping from DNS for VOIP phone number..

Listed in sections : Network & comms > Voice/internet phones

Free to try. Find, map and identify devices attached to SNMP managed ethernet switch ports..

Listed in sections : System administration > Asset management > Network management & performance

Free to try. Monitor network devices and notify of problems via email, web, logs.

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Listed in sections : Network & comms > Network information & monitoring