ServiceNow restrict user login based on IP && IP address control && installtion exists

 1)

global level :

https://docs.servicenow.com/bundle/washingtondc-platform-security/page/administer/login/task/t_AccessControl.html

IP address control configs

2) 

Indvidual level:

https://docs.servicenow.com/bundle/washingtondc-platform-security/page/script/server-scripting/reference/r_InstallationExits.html

https://www.servicenow.com/community/itsm-blog/if-multi-sso-is-installed-check-saml-installations-exits-are/ba-p/2268232

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0743808

installation exists:

local user: login.js

MUTI SSO: 

MultiSSOv2.js

*/

    process : function() {

var clientIP = gs.getSession().getClientIP().toString();

            return "failed_authentication";