127.can't be a normal domain

your local address is it's only name

the subdomains contain nothing at all

but point instead behind your firewall

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everything.127.ca (that is *.127.ca) is mapped to 127.0.0.1 (your localhost)

I use this for running virtual domains on my own systems - no local dns required

you can use it for whenever you need one or more domains to point to 127.0.0.1

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127.ca is part of the ravis dot org network