新手问题...

Router#show int s0 Serial0 is up, line protocol is down Hardware is HD64570 Internet address is 128.252.0.2/16 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) Last input 00:00:04, output 00:00:07, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0 (size/max/drops); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/64/0 (size/threshold/drops) Conversations 0/1 (active/max active) Reserved Conversations 0/0 (allocated/max allocated) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 454 packets input, 13447 bytes, 0 no buffer Received 447 broadcasts, 0 runts, 0 giants 336 input errors, 0 CRC, 0 frame, 0 overrun, 21 ignored, 0 abort 465 packets output, 13321 bytes, 0 underruns 0 output errors, 0 collisions, 199 interface resets 0 output buffer failures, 0 output buffers swapped out 11 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up 请问：Internet address is 128.252.0.2/16 中的/16是什么意思？

16指的是子网掩码，16个1，255.255.0.0的简写