enode url format
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An Ethereum node can be described with a URL scheme "enode".
The hexadecimal node ID is encoded in the username portion of the URL, separated from the host by an @ sign. The hostname can only be given as an IP address, DNS domain names are not allowed. The port in the host name section is the TCP listening port. If the TCP and UDP (discovery) ports differ, the UDP port is specified as query parameter "discport".
In the following example, the node URL describes a node with IP address
10.3.58.6, TCP listening port
30303 and UDP discovery port
The enode url scheme is used by the Node discovery protocol and can be used in the
bootnodes command line option of the client or as the argument to
suggestPeer(nodeURL) function in the JSRE.