Making an attempt to get routes for 10.0.0.0 fails with route: writing to routing socket: not in desk:
$ route -n get 10.0.0.0
route: writing to routing socket: not in desk
but it surely works for 10.0.0.1:
$ route -n get 10.0.0.1
path to: 10.0.0.1
vacation spot: default
masks: default
gateway: 10.201.0.1
interface: en0
flags: <UP,GATEWAY,DONE,STATIC,PRCLONING,GLOBAL>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
0 0 0 0 0 0 1500 0
route -n get 0.0.0.0 and route -n get 0.0.0.1 each work
100.0.0.0 fails however 100.0.0.1 works
so far as I can inform, there should not be a distinction in how these are handled within the routing desk (each ought to fall below the default route with a subsequent hop of 10.201.0.1 by way of interface en0:
$ netstat -rn
Routing tables
Web:
Vacation spot Gateway Flags Netif Expire
default 10.201.0.1 UGScg en0
10.201/16 hyperlink#15 UCS en0 !
10.201.0.1/32 hyperlink#15 UCS en0 !
10.201.0.1 0:18:a:79:ee:7e UHLWIir en0 1160
10.201.0.242/32 hyperlink#15 UCS en0 !
10.201.255.255 ff:ff:ff:ff:ff:ff UHLWbI en0 !
127 127.0.0.1 UCS lo0
127.0.0.1 127.0.0.1 UH lo0
169.254 hyperlink#15 UCS en0 !
224.0.0/4 hyperlink#15 UmCS en0 !
224.0.0.251 1:0:5e:0:0:fb UHmLWI en0
255.255.255.255/32 hyperlink#15 UCS en0 !
Working MacOS 14.7.1 (23H222)