Previous SSH survey in Autumn 2022.
In Spring 2023, I scanned ~65k random SSH hosts.
Most popular SSH server banners:
16467 serv_banner: SSH-2.0-OpenSSH_7.4
7070 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11
5465 serv_banner: SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.6
3941 serv_banner: SSH-2.0-OpenSSH_8.0
2824 serv_banner: SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u4
2438 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.5
2271 serv_banner: SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u3
1837 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.7
1668 serv_banner: SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.7
1612 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
1376 serv_banner: SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u2
1042 serv_banner: SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
1002 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.10
932 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
855 serv_banner: SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u7
830 serv_banner: SSH-2.0-OpenSSH_8.7
671 serv_banner: SSH-2.0-OpenSSH_9.6
646 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5
588 serv_banner: SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u1
520 serv_banner: SSH-2.0-OpenSSH_9.0
365 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.9
362 serv_banner: SSH-2.0-OpenSSH_9.3p1 Ubuntu-1ubuntu3.2
313 serv_banner: SSH-2.0-OpenSSH_8.4p1 Debian-5
311 serv_banner: SSH-2.0-OpenSSH_9.6p1 Ubuntu-3ubuntu13
302 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.1
287 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.3
280 serv_banner: SSH-2.0-OpenSSH_8.9p1
263 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.2
254 serv_banner: SSH-2.0-OpenSSH_7.9 FreeBSD-20200214
232 serv_banner: SSH-2.0-OpenSSH_8.4p1
...
KEX algorithms offered:
64328 kex_algorithms: diffie-hellman-group-exchange-sha256 62699 kex_algorithms: curve25519-sha256@libssh.org 61952 kex_algorithms: ecdh-sha2-nistp256 61950 kex_algorithms: ecdh-sha2-nistp384 61944 kex_algorithms: ecdh-sha2-nistp521 57380 kex_algorithms: curve25519-sha256 56943 kex_algorithms: diffie-hellman-group16-sha512 56864 kex_algorithms: diffie-hellman-group18-sha512 56256 kex_algorithms: diffie-hellman-group14-sha256 34628 kex_algorithms: diffie-hellman-group14-sha1 26616 kex_algorithms: kex-strict-s-v00@openssh.com 18861 kex_algorithms: diffie-hellman-group-exchange-sha1 15732 kex_algorithms: diffie-hellman-group1-sha1 11834 kex_algorithms: sntrup761x25519-sha512@openssh.com ...
Server host algorithms offered:
63704 server_host_algorithms: rsa-sha2-256
63703 server_host_algorithms: rsa-sha2-512
60837 server_host_algorithms: ssh-ed25519
60339 server_host_algorithms: ecdsa-sha2-nistp256
52337 server_host_algorithms: ssh-rsa
2015 server_host_algorithms: ssh-dss
847 server_host_algorithms: rsa-sha2-512-cert-v01@openssh.com
847 server_host_algorithms: rsa-sha2-256-cert-v01@openssh.com
832 server_host_algorithms: ssh-rsa-cert-v01@openssh.com
...
MAC algorithms offered:
64134 mac_algorithms: hmac-sha2-256 64120 mac_algorithms: hmac-sha2-512 62094 mac_algorithms: hmac-sha2-256-etm@openssh.com 62066 mac_algorithms: hmac-sha2-512-etm@openssh.com 61446 mac_algorithms: umac-128-etm@openssh.com 61035 mac_algorithms: umac-128@openssh.com 60644 mac_algorithms: hmac-sha1 59133 mac_algorithms: hmac-sha1-etm@openssh.com 54943 mac_algorithms: umac-64@openssh.com 54675 mac_algorithms: umac-64-etm@openssh.com ...
Encryption algorithms offered:
64588 encryption_algorithms: aes256-ctr 64024 encryption_algorithms: aes128-ctr 60953 encryption_algorithms: aes256-gcm@openssh.com 60401 encryption_algorithms: aes128-gcm@openssh.com 60109 encryption_algorithms: chacha20-poly1305@openssh.com 59000 encryption_algorithms: aes192-ctr 18820 encryption_algorithms: aes128-cbc 18790 encryption_algorithms: aes256-cbc 14933 encryption_algorithms: 3des-cbc 14679 encryption_algorithms: aes192-cbc 13638 encryption_algorithms: blowfish-cbc 13459 encryption_algorithms: cast128-cbc ...
RSA modulus in case of RSA negotiation:
36512 binlog(RSA_modulus_n): 2048
25764 binlog(RSA_modulus_n): 3072
1134 binlog(RSA_modulus_n): 4096
233 binlog(RSA_modulus_n): 1024
...
My other blog posts about SSH protocol dissected: 1, 2, 3, 4.
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