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Supernet and summarize

Paste a list of blocks. Get the shortest list that covers exactly the same addresses, for route announcements, prefix lists and firewall rules, plus the one block that would cover them all and how much extra it would include.

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How to use it

Three steps

  1. Paste your blocks. One per line. Duplicates and blocks inside other blocks are fine; they are merged.
  2. Use the summarized list. It covers exactly the same addresses with fewer entries. Copy it into a prefix list, route filter or ACL.
  3. Check the covering block. If you want a single route, the covering block is shown with how many addresses it adds that are not in your list.

Questions

Good to know

What is route summarization?

Replacing many specific routes with fewer, larger ones that cover the same addresses. 10.0.0.0/24 and 10.0.1.0/24 can be announced as one 10.0.0.0/23.

When can two blocks be merged?

When they are the same size, sit side by side, and the first starts on a boundary of the doubled size. 10.0.1.0/24 and 10.0.2.0/24 sit side by side but can't become one /23, because 10.0.1.0 is not on a /23 boundary.

What is the covering block?

The smallest single block that contains every block you entered. It may include addresses that are not yours, so check the extra count before announcing it.

What happens to blocks like 10.0.0.5/24?

They are read as the block they belong to (10.0.0.0/24) and listed so you can correct them.

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Still tracking IPs in a spreadsheet?

IPAM Enterprise keeps every /24, block, customer and circuit in one portal, and checks each assignment for overlaps before it is saved.

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