SSH access suddenly denied

I have an ssh server running on one of my home boxes. In /etc/hosts.allow I've allowed only 2 ip addresses. One of those addresses is from my workplace. The other is the local lan. I always been able to log in from work or home without issue. However, as of last Saturday I could not log in from work. I *think* my work ip address may have changed but I'm not sure. I can check later on today when I get to work but then I won't have access to the server to edit hosts.allow. How can I see denied access attempts and the addresses they came from?