IPv4 (Internet Protocol Version 4)

IPv4 (Internet Protocol Version 4) is the fourth version of the Internet Protocol; uses 32-bit addresses.


 * NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1
 * NENA-INF-016, NENA Emergency Services IP Network Design (ESIND) Information Document
 * NENA-INF-021, NENA Request for Proposal Considerations Information Document

Wikipedia definition