ed0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet hidden netmask 0xfffffc00 broadcast hidden
inet6 fe80::220:18ff:fe53:77ff%ed0 prefixlen 64 scopeid 0x1
inet hidden netmask 0xfffffc00 broadcast hidden
inet hidden netmask 0xfffffc00 broadcast hidden
inet hidden netmask 0xfffffc00 broadcast hidden
ether 00:20:18:53:77:ff
and i'm adding the following in rc.conf
ifconfig_ed0_alias3="inet hidden netmask 255.255.252.0"
those other aliases have been working for years i just need to add another one