taken from http://auntitled.blogspot.co.at/2010/07/identified-ubuntu-version-from-ssh.html and extended: Debian: Debian 4: SSH-2.0-OpenSSH_4.3p2 Debian-9 Debian 5: SSH-2.0-OpenSSH_5.1p1 Debian-5 Debian 6: SSH-2.0-OpenSSH_5.5p1 Debian-6 Debian 7: SSH-2.0-OpenSSH_6.0p1 Debian-4 Ubuntu: Ubuntu 5.10: SSH-2.0-OpenSSH_4.1p1 Debian-7ubuntu4 Ubuntu 6.04: SSH-2.0-OpenSSH_4.2p1 Debian-7ubuntu3[.x] Ubuntu 7.04: SSH-2.0-OpenSSH_4.3p2 Debian-8ubuntu1[.x] Ubuntu 7.10: SSH-2.0-OpenSSH_4.6p1 Debian-5ubuntu0[.x] Ubuntu 8.04: SSH-2.0-OpenSSH_4.7p1 Debian-8ubuntu1[.x] Ubuntu 8.10: SSH-2.0-OpenSSH_5.1p1 Debian-3ubuntu1 Ubuntu 9.04: SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1 Ubuntu 9.10: SSH-2.0-OpenSSH_5.1p1 Debian-6ubuntu2 Ubuntu 10.04: SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu3 Ubuntu 10.04.1: SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu4 Ubuntu 10.04.2: SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu{5,6} Ubuntu 10.04.3: SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu7 Ubuntu 10.10: SSH-2.0-OpenSSH_5.5p1 Debian-4ubuntu{4,5} Ubuntu 11.04: SSH-2.0-OpenSSH_5.8p1 Debian-1ubuntu3 Ubuntu 11.10: SSH-2.0-OpenSSH_5.8p1 Debian-7ubuntu1 Ubuntu 12.04: SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1 Ubuntu 13.04: SSH-2.0-OpenSSH_6.0p1 Debian-4 FreeBSD FreeBSD 7.0: SSH-2.0-OpenSSH_4.5p1 FreeBSD-20061110 FreeBSD 7.2: SSH-2.0-OpenSSH_5.1p1 FreeBSD-20080901 FreeBSD 8.0: SSH-2.0-OpenSSH_5.2p1 FreeBSD-20090522 FreeBSD 8.1: SSH-2.0-OpenSSH_5.4p1 FreeBSD-20100308 FreeBSD 9.0: SSH-2.0-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 OpenSUSE openSUSE 10.0: SSH-2.0-OpenSSH_5.0 openSUSE 10.1: SSH-2.0-OpenSSH_5.1 openSUSE 10.2: SSH-2.0-OpenSSH_5.2 CentOS CentOS 4.x: SSH-2.0-OpenSSH_3.9 CentOS 5.x: SSH-2.0-OpenSSH_4.3 CentOS 6.x: SSH-2.0-OpenSSH_5.3 Fedora Fedora 12: SSH-2.0-OpenSSH_5.2 Fedora 13: SSH-2.0-OpenSSH_5.4 Fedora 14: SSH-2.0-OpenSSH_5.5 Fedora 15: SSH-2.0-OpenSSH_5.6 Fedora 16: SSH-2.0-OpenSSH_5.8 Mac OS X Mac OS X 10.0 (Cheetah) Mac OS X 10.1 (Puma) Mac OS X 10.2 (Jaguar) Mac OS X 10.3 (Panther) ***UNVERIFIED*** OpenSSH_3.6.1p1 Mac OS X 10.4 (Tiger) OpenSSH_4.5p1, OpenSSL 0.9.7l 28 Sep 2006: SSH-2.0-OpenSSH_4.5 Mac OS X 10.5 (Leopard) OpenSSH_5.2p1, OpenSSL 0.9.7l 28 Sep 2006: SSH-2.0-OpenSSH_5.2 Mac OS X 10.6 (Snow Leopard) OpenSSH_5.2p1, OpenSSL 0.9.8y 5 Feb 2013: SSH-2.0-OpenSSH_5.2 Mac OS X 10.7 (Lion) OpenSSH_5.6p1, OpenSSL 0.9.8y 5 Feb 2013: SSH-2.0-OpenSSH_5.6 Mac OS X 10.8 (Mountain Lion) OpenSSH_5.9p1, OpenSSL 0.9.8y 5 Feb 2013 (ECC broken): SSH-2.0-OpenSSH_5.9 Mac OS X 10.9 (Mavericks) OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011: SSH-2.0-OpenSSH_6.2 Raspbian (Raspberry Pi Debian) Wheezy 2013-09-25 OpenSSH_6.0p1 Debian-4, OpenSSL 1.0.1e 11 Feb 2013: SSH-2.0-OpenSSH_6.0p1 Debian-4 ARCH Linux (Raspberry Pi) ARCH 2013-08-13, OpenSSH_6.2p2, OpenSSL 1.0.1e 11 Feb 2013: SSH-2.0-OpenSSH_6.2 complete removal of version string seems to be not desireable: http://www.snailbook.com/faq/version-string.auto.html