224.0.1.60 is a multicast broadcast used by HP printers to discover other printers or print servers.
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Number 0 is used at the end of an IPv4 address for network identifiers and number 255 is used at end of an IPv4 for broadcast addresses.
A first name, a surname, a date of birth, and an address are just some examples of fields that would not be used as primary keys. Lots of people will have the same name or same date of birth and you could have people in your database that are living at the same address, so they are likely to be duplicated and so none of those fields should be used as primary key fields.
IT MEANS the address of somewhere
127.0.0.1 is the standard IP address used for a loopback network connection.This means that if you try to connect to 127.0.0.1, you are immediately looped back to your own machine.
It is an IP address (address of a computer, router or some device) in local area network.