c7DJTLrn on Ipcalc – Command line CIDR calculator with IPv6 support

Comment on Ipcalc – Command line CIDR calculator with IPv6 support

Any idea why it doesn't give a HostMin/HostMax/Hosts field when passing an IPv6 range?

  $ ipcalc 2600:1ff2:4000::/40
  Address: 2600:1ff2:4000::                        0010011000000000:0001111111110010:0100000000000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000
  Netmask: 40                                      1111111111111111:1111111111111111:1111111100000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000
  Prefix:  2600:1ff2:4000::/40                     0010011000000000:0001111111110010:0100000000000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000:0000000000000000

peppermint_tea 4y

shameless plug, I made an ipcalc6 in rust that does it (with colors)

https://github.com/ba9f11ecc3497d9993b933fdc2bd61e5/ipcalc6

user@box:~/Documents/code/rust/ipcalc6$ cargo run 2600:1ff2:4000::/40

    Finished dev [unoptimized + debuginfo] target(s) in 0.01s

     Running `target/debug/ipcalc6 '2600:1ff2:4000::/40'`

WARNING : netmask /40 is smaller than /48, this is unusual if ip of type : Global Unicast Address and Link-Local Address

Type: Unicast Global

Address: 2600:1ff2:4000:0000:0000:0000:0000:0000

NetMask: 40

Hosts/Net: 19342813113834066795298816

Address: 0010011000000000.0001111111110010.0100000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

NetMask: 1111111111111111.1111111111111111.1111111111111111.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

HostMin: 0010011000000000.0001111111110010.0100000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

HostMax: 0010011000000000.0001111111110010.0100000000000000.1111111111111111.1111111111111111.1111111111111111.1111111111111111.1111111111111111

zamadatix 4y

"HostMin" = Prefix.

"HostMax" = Prefix followed by all f's.

"Hosts" = some ungodly large number (i.e. "small" for this is 2^64) you typically don't care about anymore.

If someone did something atypical like use a /123 (mask >64, mask not a multiple of 4) and you do actually want to see host max and host count as a result you can pass "--all-info". Otherwise a combination of the ridiculous size and hex encoding makes everything but "what is the prefix and netmask" irrelevant.

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