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[1] [3] The first released version was public domain software; all subsequent versions have been licensed under the BSD license. Ping was first included in 4.3BSD. [4] The FreeDOS version was developed by Erick Engelke and is licensed under the GPL. [5] Tim Crawford developed the ReactOS version. It is licensed under the MIT License. [6]
TRUNK-1 Trunk-1 0x18 24 TRUNK-2 Trunk-2 0x19 25 LEAF-1 Leaf-1 0x1A 26 LEAF-2 Leaf-2 0x1B 27 RDP Reliable Data Protocol: RFC 908: 0x1C 28 IRTP Internet Reliable Transaction Protocol: RFC 938: 0x1D 29 ISO-TP4 ISO Transport Protocol Class 4 RFC 905: 0x1E 30 NETBLT Bulk Data Transfer Protocol: RFC 998: 0x1F 31 MFE-NSP MFE Network Services Protocol ...
On Unix-like operating systems, traceroute sends, by default, a sequence of User Datagram Protocol (UDP) packets, with destination port numbers ranging from 33434 to 33534; the implementations of traceroute shipped with Linux, [5] FreeBSD, [6] NetBSD, [7] OpenBSD, [8] DragonFly BSD, [9] and macOS include an option to use ICMP Echo Request ...
Google Public DNS was announced on December 3, 2009, [1] in an effort described as "making the web faster and more secure." [2] [3] As of 2018, it is the largest public DNS service in the world, handling over a trillion queries per day. [4] Google Public DNS is not related to Google Cloud DNS, which is a DNS hosting service.
"IP INDEX Encyclopedia". flumps.org. Archived from the original on 14 April 2001 "IPv4 Addresses - the Complete Class A List". Infocellar. 5 April 2003. Archived from the original on 17 April 2011 "INTERNET PROTOCOL V4 ADDRESS SPACE". DonkBoy Internet. 30 June 2005
It was released on May 20, 2008 (version 1.0.0) as free software licensed under the BSD license by NLnet Labs. It is installed as part of the base system in FreeBSD starting with version 10.0, and in NetBSD with version 8.0. A version is also available in OpenBSD version 5.6 and beyond. (Previous versions of FreeBSD shipped with BIND.)
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The ICMP header starts after the IPv4 header and is identified by its protocol number, 1. [6] All ICMP packets have an eight-byte header and variable-sized data section. The first four bytes of the header have fixed format, while the last four bytes depend on the type and code of the ICMP packet.