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ipcalc 121.99.224.1/23
Address: 121.99.224.1 01111001.01100011.1110000 0.00000001
Netmask: 255.255.254.0 = 23 11111111.11111111.1111111 0.00000000
Wildcard: 0.0.1.255 00000000.00000000.0000000 1.11111111
=>
Network: 121.99.224.0/23 01111001.01100011.1110000 0.00000000
HostMin: 121.99.224.1 01111001.01100011.1110000 0.00000001
HostMax: 121.99.225.254 01111001.01100011.1110000 1.11111110
Broadcast: 121.99.225.255 01111001.01100011.1110000 1.11111111
They are in the middle of the /23 subnet
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