[gentoo-user] How many IP addresses may a NIC obtain?

[Mick]

I've rolled up a kernel for a MacBook Pro and I am wondering what might I have 
set up in there to end up with 3 sequential IP addresses ...

2: enp10s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group 
default qlen 1000
    link/ether 0c:4d:e9:cb:65:a4 brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.14/24 brd 10.10.10.255 scope global dynamic enp10s0
       valid_lft 86377sec preferred_lft 86377sec
    inet 10.10.10.15/24 brd 10.10.10.255 scope global secondary dynamic 
enp10s0
       valid_lft 86377sec preferred_lft 86377sec
    inet 10.10.10.16/24 brd 10.10.10.255 scope global secondary enp10s0
       valid_lft forever preferred_lft forever
    inet6 fe80::6ec7:552c:e2fa:7497/64 scope link 
       valid_lft forever preferred_lft forever

I haven't seen this before on my desktops, only on routers.  What setting 
might control this?
-- 
Regards,
Mick