Irenis BLANKOM HDE-4K5, User Manual

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BLANKOM HDE-4K5 User Manual
Version 1.0 – 12-2018 Page - 42 -
techn. data are subject to change w/o notice!
Registered port
A registered port is a network port (a sub-address defined within the Internet Protocol , in the range
1024–49151) assigned by the Internet Assigned Numbers Authority (IANA) (or by Internet Corporation for
Assigned Names and Numbers (ICANN) before March 21, 2001,
[1]
or by USC/ISI before 1998) for use with
a certain protocol or application.
Ports with numbers 0–1023 are called system or well-known ports ; ports with numbers 1024-49151 are
called user or registered ports , and ports with numbers 49152-65535 are called dynamic and/or private
ports .
[2]
Both system and user ports are used by transport protocols (TCP, UDP, DCCP, SCTP) to indicate an
application or service.

Ports 0–1023 – system or well-known ports

Ports 1024–49151 – user or registered ports

Ports >49151 – dynamic / private ports
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
Range for Ephemeral port
The Internet Assigned Numbers Authority (IANA) suggests the range 49152 to 65535 (2
15
+2
14
to 2
16
−1) for dynamic
or private ports.
[1]
Many Linux kernels use the port range 32768 to 61000.
[note 2]
FreeBSD has used the IANA port range since release
4.6. Previous versions, including the Berkeley Software Distribution (BSD), use ports 1024 to 5000 as ephemeral
ports.
[2][3]
Microsoft Windows operating systems through XP use the range 1025–5000 as ephemeral ports by default.
[4]
Windows Vista , Windows 7 , and Server 2008 use the IANA range by default.
[5]
Windows Server 2003 uses the range
1025–5000 by default, until Microsoft security update MS08-037 from 2008 is installed, after which it uses the
IANA range by default.
[6]
Windows Server 2008 with Exchange Server 2007 installed has a default port range of
1025–60000.
[7]
In addition to the default range, all versions of Windows since Windows 2000 have the option of
specifying a custom range anywhere within 1025–65535.
[8][9]
Packet structure
UDP Header
Offsets Octet 0 1 2 3
Octet Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
0 0 Source port Destination port
4 32 Length Checksum
The UDP header consists of 4 fields, each of which is 2 bytes (16 bits).
[1]
The use of the fields "Checksum" and "Source port" is
optional in IPv4 (pink background in table). In IPv6 only the source port is optional (see below).