Please add sipcalc package to vyos 1.3.
It was included in 1.2, and I think it should be included in 1.3 as well.
It is neater than ipcalc. In sipcalc you can add interface to calculcate network directly on a connected interface. And is has a few other options than ipcalc.
email@example.com:~$ sipcalc eth1.302 -[int-ipv4 : eth1.302] - 0 [CIDR] Host address - 172.24.0.89 Host address (decimal) - 2887254105 Host address (hex) - AC180059 Network address - 172.24.0.88 Network mask - 255.255.255.248 Network mask (bits) - 29 Network mask (hex) - FFFFFFF8 Broadcast address - 172.24.0.95 Cisco wildcard - 0.0.0.7 Addresses in network - 8 Network range - 172.24.0.88 - 172.24.0.95 Usable range - 172.24.0.89 - 172.24.0.94