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loopback address?

gaurang.malgaonkar
Level 1
Level 1

‎09-06-2010 12:49 PM - edited ‎03-06-2019 12:51 PM

my question is that why we assign the complete subnet 127.0.0.1 to 127.255.255.255 to loopback addresses. why we require that much of loopback addresses?

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Peter Paluch
Cisco Employee
Cisco Employee

‎09-06-2010 12:54 PM

Hello,

I do not know for sure but I assume that the IP address space 127.0.0.0/8 was set aside for loopback purposes so that you can create an entire "internetwork" inside your PC. Having just a single address would be quite limiting if you wanted to test scenarios on your PC that required more IP addresses. Having the entire A block 127.0.0.0/8 at your discretion for loopback purposes provides you with a great flexibility in choosing IP addresses according to your needs.

See the RFC 5735 at http://tools.ietf.org/html/rfc5735 for slightly more information about this.

Best regards,

Peter

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