To view and manage the IP addresses/subnets and IP space, I would recommend looking into an IP Address Management solution that would eliminate spreadsheet data entry. Address Commander by Incognito is one solution. It tracks organization-wide IP address space; links all IP addresses with business units and, regional offices, subscribers or other entities; centralizes address allocation policies; and automates the reporting and receipt of IP address space from RIR (ARIN/RIPE). Would that serve your purpose? Are you a Sys-Admin in Cable/DSL service provider or in an Enterprise?
Also, another thing to consider, if you wanted to also manage DHCP services on your network, you could also look into Broadband Command Center, which would work together with Address Commander as a complete DHCP and IP Management solution.
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To view and manage the IP addresses/subnets and IP space, I would recommend looking into an IP Address Management solution that would eliminate spreadsheet data entry. Address Commander by Incognito is one solution. It tracks organization-wide IP address space; links all IP addresses with business units and, regional offices, subscribers or other entities; centralizes address allocation policies; and automates the reporting and receipt of IP address space from RIR (ARIN/RIPE). Would that serve your purpose? Are you a Sys-Admin in Cable/DSL service provider or in an Enterprise? Also, another thing to consider, if you wanted to also manage DHCP services on your network, you could also look into Broadband Command Center, which would work together with Address Commander as a complete DHCP and IP Management solution.