pcap_lookupnet(3) on FreeBSD
The text 4e13fbf42387, as FreeBSD 12.1-RELEASE, FreeBSD 12.0-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE shipped it.
find the IPv4 network number and netmask for a device
The text 4e13fbf42387, as FreeBSD 12.1-RELEASE, FreeBSD 12.0-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE shipped it.
find the IPv4 network number and netmask for a device