Add simple README

lonepeon · Jun 22, 2022 · 3c782b4 · 3c782b4
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+# ipcalc
+
+Small tool based on https://linux.die.net/man/1/ipcalc which describes the given IPv4.
+
+```
+$ ipcalc 10.12.23.43/20
+Address:   10.12.23.43          00001010.00001100.00010111.00101011
+Netmask:   255.255.240.0 = 20   11111111.11111111.11110000.00000000
+Wildcard:  0.0.15.255           00000000.00000000.00001111.11111111
+=>
+Network:   10.12.16.0/20        00001010.00001100.00010000.00000000
+HostMin:   10.12.16.1           00001010.00001100.00010000.00000001
+HostMax:   10.12.31.254         00001010.00001100.00011111.11111110
+Broadcast: 10.12.31.255         00001010.00001100.00011111.11111111
+Hosts/Net: 4094                 class A, Private Internet
+```