公共的 wifi 意味着什么?

相当环境到底有多少个设备

fping -a -g 192.168.77.0/24 192.168.77.1 192.168.77.2 192.168.77.3 192.168.77.4 192.168.77.5 192.168.77.6 192.168.77.7 192.168.77.8 192.168.77.61 192.168.77.62 192.168.77.88 192.168.77.91 192.168.77.97 192.168.77.99 192.168.77.103 192.168.77.104 192.168.77.100 192.168.77.105 192.168.77.112 192.168.77.106 192.168.77.185 192.168.77.188 192.168.77.190 192.168.77.189 192.168.77.189 : duplicate for [0], 64 bytes, 131 ms 192.168.77.254 192.168.77.253 192.168.77.252

nmap -sn 192.168.77.0/24

🤒 arp -an ? (192.168.77.0) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet] ? (192.168.77.1) at 28:c9:7a:6e:6:28 on en0 ifscope [ethernet] ? (192.168.77.2) at f8:38:8d:bd:1f:9c on en0 ifscope [ethernet] ? (192.168.77.3) at f8:38:8d:bd:1f:a4 on en0 ifscope [ethernet] ? (192.168.77.4) at f8:38:8d:bd:7:f6 on en0 ifscope [ethernet] ? (192.168.77.5) at f8:38:8d:bd:1f:a6 on en0 ifscope [ethernet] ? (192.168.77.6) at f8:38:8d:bd:1f:a0 on en0 ifscope [ethernet] ? (192.168.77.7) at 82:2d:d8:86:db:90 on en0 ifscope [ethernet] ? (192.168.77.8) at e2:94:f4:92:ef:dc on en0 ifscope [ethernet] ? (192.168.77.9) at 28:a4:4a:cf:e:95 on en0 ifscope [ethernet] ? (192.168.77.10) at 2:86:57:a:5e:78 on en0 ifscope [ethernet] ? (192.168.77.11) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.12) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.13) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.14) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.15) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.16) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.17) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.18) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.19) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.20) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.21) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.22) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.23) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.24) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.25) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.26) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.27) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.28) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.29) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.30) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.31) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.32) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.33) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.34) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.35) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.36) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.37) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.38) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.39) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.40) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.41) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.42) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.43) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.44) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.45) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.46) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.47) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.48) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.49) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.50) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.51) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.52) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.53) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.54) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.55) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.56) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.57) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.58) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.59) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.60) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.61) at 58:23:bc:1c:25:b9 on en0 ifscope [ethernet] ? (192.168.77.62) at 22:c:85:a6:f:71 on en0 ifscope [ethernet] ? (192.168.77.63) at b4:9c:df:e6:96:68 on en0 ifscope [ethernet] ? (192.168.77.64) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.65) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.66) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.67) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.68) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.69) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.70) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.71) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.72) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.73) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.74) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.75) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.76) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.77) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.78) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.79) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.80) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.81) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.82) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.83) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.84) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.85) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.86) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.87) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.88) at 9c:47:82:a8:2e:e6 on en0 ifscope [ethernet] ? (192.168.77.89) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.90) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.91) at 9c:47:82:a8:3a:c9 on en0 ifscope [ethernet] ? (192.168.77.92) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.93) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.94) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.95) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.96) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.97) at 9c:47:82:a8:39:10 on en0 ifscope [ethernet] ? (192.168.77.98) at 6:1:2d:49:50:da on en0 ifscope [ethernet] ? (192.168.77.99) at e6:b9:bb:9:e0:7c on en0 ifscope [ethernet] ? (192.168.77.100) at ea:69:38:c0:84:5 on en0 ifscope [ethernet] ? (192.168.77.101) at 4e:37:e7:e6:32:3e on en0 ifscope [ethernet] ? (192.168.77.102) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.103) at 9c:47:82:a8:3a:b8 on en0 ifscope [ethernet] ? (192.168.77.104) at e6:9b:56:9e:48:64 on en0 ifscope [ethernet] ? (192.168.77.105) at 6e:ce:2c:a6:5a:9c on en0 ifscope [ethernet] ? (192.168.77.106) at ae:32:e4:eb:36:c2 on en0 ifscope [ethernet] ? (192.168.77.107) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.108) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.109) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.110) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.111) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.112) at f8:ce:21:45:b0:39 on en0 ifscope [ethernet] ? (192.168.77.113) at 68:ed:a4:7c:9f:df on en0 ifscope [ethernet] ? (192.168.77.114) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.115) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.116) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.117) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.118) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.119) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.120) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.121) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.122) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.123) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.124) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.125) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.126) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.127) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.128) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.129) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.130) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.131) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.132) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.133) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.134) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.135) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.136) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.137) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.138) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.139) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.140) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.141) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.142) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.143) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.144) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.145) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.146) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.147) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.148) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.149) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.150) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.151) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.152) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.153) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.154) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.155) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.156) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.157) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.158) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.159) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.160) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.161) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.162) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.163) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.164) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.165) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.166) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.167) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.168) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.169) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.170) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.171) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.172) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.173) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.174) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.175) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.176) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.177) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.178) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.179) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.180) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.181) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.182) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.183) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.184) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.185) at b0:2e:ba:49:e2:6a on en0 ifscope [ethernet] ? (192.168.77.186) at 96:47:b6:8d:58:92 on en0 ifscope [ethernet] ? (192.168.77.187) at f2:58:2:79:77:79 on en0 ifscope [ethernet] ? (192.168.77.188) at 9c:3e:53:70:46:6 on en0 ifscope permanent [ethernet] ? (192.168.77.189) at 16:5d:bd:9b:0:ab on en0 ifscope [ethernet] ? (192.168.77.190) at be:7d:d9:c:29:4 on en0 ifscope [ethernet] ? (192.168.77.191) at e0:c2:64:3d:7a:a2 on en0 ifscope [ethernet] ? (192.168.77.192) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.193) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.194) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.195) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.196) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.197) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.198) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.199) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.200) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.201) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.202) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.203) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.204) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.205) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.206) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.207) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.208) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.209) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.210) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.211) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.212) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.213) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.214) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.215) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.216) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.217) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.218) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.219) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.220) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.221) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.222) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.223) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.224) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.225) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.226) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.227) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.228) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.229) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.230) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.231) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.232) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.233) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.234) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.235) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.236) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.237) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.238) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.239) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.240) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.241) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.242) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.243) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.244) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.245) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.246) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.247) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.248) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.249) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.250) at (incomplete) on en0 ifscope [ethernet] ? (192.168.77.251) at 68:ed:a4:7c:9f:b7 on en0 ifscope [ethernet] ? (192.168.77.252) at 22:e5:f1:32:a4:36 on en0 ifscope [ethernet] ? (192.168.77.253) at 62:0:46:ba:75:7d on en0 ifscope [ethernet] ? (192.168.77.254) at 62:bd:1b:58:52:3d on en0 ifscope [ethernet] ? (192.168.77.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet] ? (224.0.0.251) at 1:0:5e:0:0:fb on en0 ifscope permanent [ethernet] ? (239.255.255.250) at 1:0:5e:7f:ff:fa on en0 ifscope permanent [ethernet]

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