MonitorTT is a free app to monitor any IP / WebSite / Email / DNS / RDP / SIP or any other services with a port number and will send a notification if the status of any monitor changes from on to off.
You can add a monitor directly on your iPhone/iPad without signing up. Or you can sign up with your email and then you can get your monitors from other iPhone/iPads after you login.
You can check the history data of one monitor and see when the status changes and some text information about the change of status. You can see detailed information about one monitor like the country, states/province/region, city, postal code, map location, timezone etc.
The free account allows you to have up to 5 monitors for free. If you want more, you can buy more monitors with different date ranges. You can get some advanced features as below after you buy more monitors.
1. Add up to 100 monitors
2. See more information about one monitor
3. Add new categories and categorize your monitors
4. Check longer history data
5. Change monitor interval ( by default its 15 minutes ).