An IPv4 prefix. Host bits are masked off, so 10.72.5.9/14 becomes 10.72.0.0/14. | |
An IPv6 prefix, in any form — 2001:0db8:0000:…:0000/48 is accepted and printed back compressed and lowercase (RFC 5952). | |
A bare address means a single host: /32 for IPv4, /128 for IPv6. | |
An address range. It becomes the fewest prefixes that cover it exactly — the note underneath says whether one prefix was enough, and what rounding up to a single prefix would cost. The separator can be -, to or .. (en and em dashes work too), and reversed ends are swapped. | |
| Ranges work the same in IPv6. | |
| Several bases at once, separated by commas, semicolons or newlines. Each becomes its own tree. | |
| IPv4 and IPv6 together in one plan. Totals are then reported per family. |
An entry already covered by a larger one is dropped, and a plan is saved in your browser — setting a new base replaces the current one.