Example Company ABC purchased a dozen of Public IP blocks. First create "container blocks" to outline what is available to carve out. Afterwards engineers carve out blocks from those "container blocks", IPAM show report what is currently available - empty spaces in between.
Container "ARIN Block1" - 126.96.36.199/26 (Mask:255.255.255.192; Range:188.8.131.52 - 184.108.40.206)
-Available - Range:220.127.116.11 - 18.104.22.168
Container "ARIN Block2" - 22.214.171.124/24 (Mask:255.255.255.0; Range:126.96.36.199 - 188.8.131.52)
-Available - Range:184.108.40.206 - 220.127.116.11
-Vlan10 - 18.104.22.168/28 (Mask:255.255.255.240; Range:22.214.171.124 - 126.96.36.199)
-Available - Range:188.8.131.52 - 184.108.40.206
Container "ARIN Block3" - 220.127.116.11/24 (Mask:255.255.255.0; Range:18.104.22.168 - 22.214.171.124)
-Vlan99 - 126.96.36.199/24 (Mask:255.255.255.240; Range:188.8.131.52 - 184.108.40.206)
Notice the last block was not chopped into smaller pieces(ie. smaller bit mask), but the "container" was used entirely by single "reserve" block. That would be an exception to the rule.
This kind of management would allow to not only define what is available, but make it easier for Jr. Engineers to navigate IPAM as well. As well as run reports on available Public IPs that the company can utilize.
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