Force a user to login from specific hostname

How can an administrator force a user to login from specific hostname only?

Subject: Domcfg.nsf

Modify the login form in dom config to redirect the user to that host name

https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_9.0.1/admin/conf_customizingthehtmlloginform_t.html https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_9.0.1/admin/conf_customizingthehtmlloginform_t.html