Por que essa estranheza ao usar o nmap?

Meu roteador doméstico (Mikrotik RB750Gr2) tem um endereço IP interno 192.168.1.1e uma tabela de roteamento parecida com esta:

#      DST-ADDRESS        PREF-SRC        GATEWAY            DISTANCE
0 ADS  0.0.0.0/0                          174.67.140.1              1
1 ADC  174.67.140.0/23    174.67.141.204  ether1                    0
2 ADC  192.168.0.0/16     192.168.1.1     bridge1                   0

No meu PC de mesa ( 192.168.1.10, se for importante), executei o nmap para escanear toda a minha /16rede, mas parece ter tentado escanear 192/8.

O que eu fiz errado?

ron@haggis:~$ sudo nmap -A -T4 192.168/16
[sudo] password for ron: 

Starting Nmap 7.60 ( https://nmap.org ) at 2021-01-16 23:01 CST
Warning: 192.0.7.15 giving up on port because retransmission cap hit (6).
Warning: 192.0.7.24 giving up on port because retransmission cap hit (6).
Warning: 192.0.8.33 giving up on port because retransmission cap hit (6).
[snip]
Warning: 192.0.5.61 giving up on port because retransmission cap hit (6).
Warning: 192.0.5.154 giving up on port because retransmission cap hit (6).
^C