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I'm new to networking. I know that some IPs don't have a sub net mask like 127.0.0.1 and the range that starts with 127. I wanted to know if there is any other IPs that don't have sub net mask.
IP addresses don't have subnet masks. Networks do. For the loopback address, the entire /8 is reserved, so it's 127.0.0.0/8 or 255.0.0.0.
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