Founder of Shodan John Matherly was revamping the SSH banner and collecting the fingerprint, when he observed that a few SSH keys were used by several devices. More than 250,000 routers used in Spain and deployed by Telefonica de Espana, and thousands more used in other countries worldwide are using the same SSH keys. The expert highlighted that a small percentage of routers configured to allow a remote access may be vulnerable to cyber attack because share the same private key. Matherley has published on GitHub the list of unique fingerprints discovered in his analysis with Python script.”]
Source: http://securityaffairs.co/wordpress/33888/hacking/shodan-routers-ssh-keys.html