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IP addresses that have 127 in the first octet (for example 127.0.0.1) are reserved for loopback addresses, meaning that they point back to the local computer. For example, if I ping 127.0.0.1 from my computer, I will get a reply from my own computer. This works with any IP address beginning with 127. For example pinging 127.34.100.12 (last three octets can be any number between 0 and 255) pings my local computer as well.

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Q: What special about address containing 127 in the first octet and how this address is used troubleshooting?
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