We used spreadsheets in the past and they were problematic. Lot's of errors, poor clean up of retired addresses, etc. We don't use solarwinds IPAM but we do use Infoblox Trinzic appliances. We just finished a hardware refresh on them. We are so confident in the solution that we let appropriate end users do what they need all by themselves. Get there own IP's, add, delete, change DNS records, reserve DHCP addresses, etc. I can't remember the last time a duplicate IP was accidentally assigned. The solution we use can also do an active discovery on network segments to try and expose machines not responding to ICMP and that do not have any other records within the services running on the Infoblox.. Very similar to nmap.
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