通过以下命令，可以按网段ping所有的主机，并返回那些ip状态为在线，前提是安装nmap
命令:
nmap -sP 220.181.38.0/24
运行结果如下：
➜ ~ nmap -sP 220.181.38.0/24
Starting Nmap 6.40 ( http://nmap.org ) at 2021-06-26 11:27 CST
Nmap scan report for 220.181.38.97
Host is up (0.16s latency).
Nmap scan report for 220.181.38.98
Host is up (0.16s latency).
Nmap scan report for 220.181.38.99
Host is up (0.18s latency).
Nmap scan report for 220.181.38.129
Host is up (0.16s latency).
Nmap scan report for 220.181.38.130
Host is up (0.16s latency).
Nmap scan report for 220.181.38.132
Host is up (0.16s latency).
Nmap scan report for 220.181.38.133
Host is up (0.16s latency).
Nmap scan report for 220.181.38.134
Host is up (0.16s latency).
Nmap scan report for 220.181.38.135
Host is up (0.17s latency).
Nmap scan report for 220.181.38.136
Host is up (0.17s latency).
Nmap scan report for 220.181.38.137
Host is up (0.17s latency).
Nmap scan report for 220.181.38.138
Host is up (0.18s latency).
Nmap scan report for 220.181.38.139
Host is up (0.16s latency).
Nmap scan report for 220.181.38.140
Host is up (0.16s latency).
Nmap scan report for 220.181.38.141
Host is up (0.16s latency).
Nmap scan report for 220.181.38.142
Host is up (0.16s latency).
Nmap scan report for 220.181.38.143
Host is up (0.16s latency).
Nmap scan report for 220.181.38.144
Host is up (0.16s latency).
Nmap scan report for 220.181.38.145
Host is up (0.16s latency).
Nmap scan report for 220.181.38.146
Host is up (0.16s latency).
Nmap scan report for 220.181.38.148
Host is up (0.17s latency).
Nmap scan report for 220.181.38.149
Host is up (0.16s latency).
Nmap scan report for 220.181.38.150
Host is up (0.16s latency).
Nmap scan report for 220.181.38.151
Host is up (0.16s latency).
Nmap scan report for 220.181.38.152
Host is up (0.17s latency).
Nmap scan report for 220.181.38.153
Host is up (0.17s latency).
Nmap scan report for 220.181.38.154
Host is up (0.17s latency).
Nmap scan report for mx10.baidu.com (220.181.38.155)
Host is up (0.16s latency).
Nmap scan report for 220.181.38.156
Host is up (0.17s latency).
Nmap scan report for 220.181.38.157
Host is up (0.17s latency).
Nmap scan report for 220.181.38.158
Host is up (0.16s latency).
Nmap scan report for 220.181.38.159
Host is up (0.18s latency).
Nmap scan report for 220.181.38.160
Host is up (0.17s latency).
Nmap scan report for 220.181.38.161
Host is up (0.17s latency).
Nmap scan report for 220.181.38.162
Host is up (0.16s latency).
Nmap scan report for 220.181.38.163
Host is up (0.16s latency).
Nmap scan report for 220.181.38.164
Host is up (0.16s latency).
Nmap scan report for 220.181.38.165
Host is up (0.16s latency).
Nmap scan report for 220.181.38.166
Host is up (0.16s latency).
Nmap scan report for 220.181.38.167
Host is up (0.17s latency).
Nmap scan report for 220.181.38.168
Host is up (0.17s latency).
Nmap scan report for 220.181.38.170
Host is up (0.17s latency).
Nmap scan report for 220.181.38.171
Host is up (0.16s latency).
Nmap scan report for 220.181.38.172
Host is up (0.16s latency).
Nmap scan report for 220.181.38.173
Host is up (0.16s latency).
Nmap scan report for 220.181.38.174
Host is up (0.18s latency).
Nmap scan report for 220.181.38.175
Host is up (0.16s latency).
Nmap scan report for 220.181.38.176
Host is up (0.21s latency).
Nmap scan report for 220.181.38.177
Host is up (0.17s latency).
Nmap scan report for 220.181.38.178
Host is up (0.16s latency).
Nmap scan report for 220.181.38.179
Host is up (0.15s latency).
Nmap scan report for 220.181.38.180
Host is up (0.17s latency).
Nmap scan report for 220.181.38.181
Host is up (0.16s latency).
Nmap scan report for 220.181.38.182
Host is up (0.16s latency).
Nmap scan report for 220.181.38.183
Host is up (0.18s latency).
Nmap scan report for 220.181.38.184
Host is up (0.16s latency).
Nmap scan report for 220.181.38.185
Host is up (0.17s latency).
Nmap scan report for 220.181.38.186
Host is up (0.16s latency).
Nmap scan report for 220.181.38.187
Host is up (0.16s latency).
Nmap scan report for 220.181.38.188
Host is up (0.17s latency).
Nmap scan report for 220.181.38.189
Host is up (0.16s latency).
Nmap scan report for 220.181.38.190
Host is up (0.17s latency).
Nmap scan report for 220.181.38.191
Host is up (0.17s latency).
Nmap scan report for 220.181.38.192
Host is up (0.16s latency).
Nmap scan report for 220.181.38.193
Host is up (0.16s latency).
Nmap scan report for 220.181.38.194
Host is up (0.17s latency).
Nmap scan report for 220.181.38.195
Host is up (0.17s latency).
Nmap scan report for 220.181.38.196
Host is up (0.17s latency).
Nmap scan report for 220.181.38.197
Host is up (0.17s latency).
Nmap scan report for 220.181.38.198
Host is up (0.17s latency).
Nmap scan report for 220.181.38.199
Host is up (0.16s latency).
Nmap scan report for 220.181.38.200
Host is up (0.17s latency).
Nmap scan report for 220.181.38.201
Host is up (0.17s latency).
Nmap scan report for 220.181.38.202
Host is up (0.17s latency).
Nmap scan report for 220.181.38.203
Host is up (0.16s latency).
Nmap scan report for 220.181.38.204
Host is up (0.15s latency).
Nmap scan report for 220.181.38.205
Host is up (0.17s latency).
Nmap scan report for 220.181.38.206
Host is up (0.16s latency).
Nmap scan report for 220.181.38.207
Host is up (0.16s latency).
Nmap scan report for 220.181.38.208
Host is up (0.16s latency).
Nmap scan report for 220.181.38.209
Host is up (0.17s latency).
Nmap scan report for 220.181.38.210
Host is up (0.17s latency).
Nmap scan report for 220.181.38.211
Host is up (0.16s latency).
Nmap scan report for 220.181.38.213
Host is up (0.17s latency).
Nmap scan report for 220.181.38.214
Host is up (0.17s latency).
Nmap scan report for 220.181.38.215
Host is up (0.17s latency).
Nmap scan report for 220.181.38.216
Host is up (0.17s latency).
Nmap scan report for 220.181.38.217
Host is up (0.16s latency).
Nmap scan report for 220.181.38.218
Host is up (0.16s latency).
Nmap scan report for 220.181.38.219
Host is up (0.17s latency).
Nmap scan report for 220.181.38.220
Host is up (0.17s latency).
Nmap scan report for 220.181.38.221
Host is up (0.17s latency).
Nmap scan report for 220.181.38.222
Host is up (0.16s latency).
Nmap scan report for 220.181.38.223
Host is up (0.17s latency).
Nmap scan report for 220.181.38.224
Host is up (0.17s latency).
Nmap scan report for 220.181.38.225
Host is up (0.16s latency).
Nmap scan report for 220.181.38.226
Host is up (0.17s latency).
Nmap scan report for 220.181.38.227
Host is up (0.17s latency).
Nmap scan report for 220.181.38.228
Host is up (0.17s latency).
Nmap scan report for 220.181.38.229
Host is up (0.17s latency).
Nmap scan report for 220.181.38.230
Host is up (0.17s latency).
Nmap scan report for 220.181.38.231
Host is up (0.17s latency).
Nmap scan report for 220.181.38.232
Host is up (0.16s latency).
Nmap scan report for 220.181.38.233
Host is up (0.16s latency).
Nmap scan report for 220.181.38.234
Host is up (0.17s latency).
Nmap scan report for 220.181.38.235
Host is up (0.17s latency).
Nmap scan report for 220.181.38.236
Host is up (0.17s latency).
Nmap scan report for 220.181.38.237
Host is up (0.18s latency).
Nmap scan report for 220.181.38.238
Host is up (0.17s latency).
Nmap scan report for 220.181.38.239
Host is up (0.16s latency).
Nmap scan report for 220.181.38.240
Host is up (0.15s latency).
Nmap scan report for 220.181.38.241
Host is up (0.16s latency).
Nmap scan report for 220.181.38.242
Host is up (0.16s latency).
Nmap scan report for 220.181.38.243
Host is up (0.17s latency).
Nmap scan report for 220.181.38.244
Host is up (0.16s latency).
Nmap scan report for 220.181.38.245
Host is up (0.17s latency).
Nmap scan report for 220.181.38.246
Host is up (0.17s latency).
Nmap scan report for 220.181.38.247
Host is up (0.16s latency).
Nmap scan report for mx9.baidu.com (220.181.38.248)
Host is up (0.17s latency).
Nmap scan report for 220.181.38.249
Host is up (0.16s latency).
Nmap scan report for 220.181.38.250
Host is up (0.16s latency).
Nmap scan report for 220.181.38.251
Host is up (0.16s latency).
Nmap scan report for 220.181.38.252
Host is up (0.17s latency).
Nmap scan report for 220.181.38.253
Host is up (0.17s latency).
Nmap scan report for 220.181.38.254
Host is up (0.16s latency).
Nmap done: 256 IP addresses (125 hosts up) scanned in 24.79 seconds