Url & E-mail addresses are used to indicate links to resources located in the LAN/WAN.
addresses identification occurs, usually on the first level domain name or protocol/schema type.
Options Url protocols:

• ftp — File Transfer Protocol FTP
• http — Hypertext Transfer Protocol HTTP
• rtmp — Real Time Messaging Protocol proprietary protocol streaming, mainly used for streaming video and audio from the web cameras via the Internet.
• rtsp — Real Time Streaming Protocol.
• https — Special protocol implementation HTTP, using encryption (usually, SSL or TLS)
• gopher — Gopher protocol
• mailto — Address Email
• nntp — Usenet news via NNTP protocol
• irc — IRC protocol
• telnet — Link to an interactive session Telnet
• xmpp — XMPP protocol (part of Jabber)
• file — Name of the local file

In this case, the more extended list.
Example Url links: https://en.wikipedia.org/wiki/.
Example E-mail адреса: [email protected].
Presented component demonstrates the allocation Url & E-mail addresses in the text.