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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.

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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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  • So the IPs that have 127 as their first octet, have netmask too? For example for 127.0.25.1, the netmask is 255.0.0.0?
    – Pablo
    Jun 12, 2020 at 19:45
  • @Pablo The reserved loopback is 127.0.0.0/8, so you can use any address from 127.0.0.1 to 127.255.255.254.
    – Zac67
    Jun 12, 2020 at 19:49
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    The loopback address is a special reserved case (See RFC 1122).
    – Ron Trunk
    Jun 12, 2020 at 19:49

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