Numbers, as well as common ports for trojan backdoors and otherĪpplications that don't bother registering with the Internet Assigned Port number, one can often guess what services open ports represent.Ĭontaining the well-known service for registered port and protocol Further IP, TCP,Īnd UDP header layout details can be found inīecause most popular services are registered to a well-known IPv4 addresses have a length of 32-bits, while ports areġ6-bits long. For example, TCP is protocol number six, and The protocol is anĮight-bit field, which specifies what type of packet is contained in the The headers of each packet sent between hosts. All of these elements are simply numbers placed in Source and destination IP addresses and corresponding source andĭestination ports. AĬonnection for each protocol is uniquely identified by four elements: Nmap works with two protocols that use ports: TCP and UDP. If you specify the secure HTTPS protocol instead, the browser For example, your webīrowser will by default connect to TCP port 80 of machines in HTTP Used to identify machines on networks, ports identify specificĪpplications in use on a single machine. Ports are simply a software abstraction, used to distinguishīetween communication channels.
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