domnet

domnet is a bare-bones tool for calculating the inverse of a collection of IP subnets, which may be useful if you're doing weird routing nonsense.

examples

$ domnet 192.168.1.0/24
0.0.0.0/1
128.0.0.0/2
192.0.0.0/9
192.128.0.0/11
192.160.0.0/13
192.168.0.0/24
192.168.2.0/23
192.168.4.0/22
192.168.8.0/21
192.168.16.0/20
192.168.32.0/19
192.168.64.0/18
192.168.128.0/17
192.169.0.0/16
192.170.0.0/15
192.172.0.0/14
192.176.0.0/12
192.192.0.0/10
193.0.0.0/8
194.0.0.0/7
196.0.0.0/6
200.0.0.0/5
208.0.0.0/4
224.0.0.0/3

$ domnet fd00:0123:abcd::/48 2001:7f8::/29
::/3
2000::/16
2001::/22
2001:400::/23
2001:600::/24
2001:700::/25
2001:780::/26
2001:7c0::/27
2001:7e0::/28
2001:7f0::/29
2001:800::/21
2001:1000::/20
2001:2000::/19
2001:4000::/18
2001:8000::/17
2002::/15
2004::/14
2008::/13
2010::/12
2020::/11
2040::/10
2080::/9
2100::/8
2200::/7
2400::/6
2800::/5
3000::/4
4000::/2
8000::/2
c000::/3
e000::/4
f000::/5
f800::/6
fc00::/8
fd00::/24
fd00:100::/27
fd00:120::/31
fd00:122::/32
fd00:123::/33
fd00:123:8000::/35
fd00:123:a000::/37
fd00:123:a800::/39
fd00:123:aa00::/40
fd00:123:ab00::/41
fd00:123:ab80::/42
fd00:123:abc0::/45
fd00:123:abc8::/46
fd00:123:abcc::/48
fd00:123:abce::/47
fd00:123:abd0::/44
fd00:123:abe0::/43
fd00:123:ac00::/38
fd00:123:b000::/36
fd00:123:c000::/34
fd00:124::/30
fd00:128::/29
fd00:130::/28
fd00:140::/26
fd00:180::/25
fd00:200::/23
fd00:400::/22
fd00:800::/21
fd00:1000::/20
fd00:2000::/19
fd00:4000::/18
fd00:8000::/17
fd01::/16
fd02::/15
fd04::/14
fd08::/13
fd10::/12
fd20::/11
fd40::/10
fd80::/9
fe00::/7