Using the history of congress editing wikipedia pages I found the answer -- they are their own ISP: http://whois.arin.net/rest/net/NET-143-228-0-0-1/pft http:/

Using the history of congress editing wikipedia pages I found the answer -- they are their own ISP: http://whois.arin.net/rest/net/NET-143-228-0-0-1/pft http://whois.arin.net/rest/net/NET-143-228-0-0-1/pft http://whois.arin.net/rest/net/NET-143-231-0-0-1/pft http://whois.arin.net/rest/net/NET-143-231-0-0-1/pft https://en.wikipedia.org/wiki/Wikipedia:Congressional_staffer_edits#United_States_House_of_Representatives https://en.wikipedia.org/wiki/Wikipedia:Congressional_staffe... https://www.whoismyisp.org/ip/143.228.255.255 https://www.whoismyisp.org/ip/143.228.255.255