This number is one of the most important elements of every invoice.
Its role is to identify transactions, so it needs to be unique.
There a number of Internet organizations involved with helping to keep the network operating smoothly and efficiently.
Each one takes care of one aspect of the Internet and carefully follows policies and procedures (that are set up by other Internet organizations).
Part of the IP address allocation process has been simplified by assigning large blocks of IP addresses to Regional Internet Registries (RIR).
Each RIR is responsible for managing the IP addresses assigned to their region on behalf of IANA.
Invoice number can contain only numbers or letters and numbers.
It may contain date of issue, name of project or task. In most simple words an invoice is a document issued by a seller to a buyer that specifies amount and costs of services or products provided by the seller.
That's why behind the extensive and global yet seemingly simple Internet, there is an order and system that helps keep it working smoothly..with details as small as our IP address.
For networking administrators and those who want to build private home or office networks, there are blocks of private IP addresses that are reserved for special use.