Frequently Asked Questions

What User-Agent does Uptime use?

Better Uptime Bot Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

What phone numbers will Uptime call me from?

We encourage you to save the number below so you know who's calling you at 4am.

  • US: (256) 485-4958
  • Europe: +32 460 23 47 47
  • Other countries: (256) 485-4958

What phone numbers will Uptime use for sending SMS?

  • (872) 231-5748
  • (872) 269-8180
  • (872) 278-6922
  • (872) 278-6921
  • (872) 766-0008

What IPs does Uptime use?

We highly recommend you configure your firewall based on our User-Agent since our IPs will change from time to time.

  • AS:,,,,,,,,,, 2400:8902::f03c:92ff:fe47:3951, 2400:8902::f03c:92ff:fe47:395f, 2400:8901::f03c:93ff:feb1:9809, 2400:8901::f03c:93ff:feb1:9886, 2400:8901::f03c:94ff:fed1:c983, 2400:8901::f03c:94ff:fed1:c9d4, 2400:8902::f03c:94ff:fed1:c9ea, 2400:8902::f03c:94ff:fed1:c914, 2400:8901::f03c:94ff:fe4f:5eae, 2400:8902::f03c:94ff:fe4f:7d99

  • AU:,,,,,,, 2400:8907::f03c:92ff:fe47:3955, 2400:8907::f03c:92ff:fe47:397a, 2400:8907::f03c:92ff:fe47:399e, 2400:8907::f03c:94ff:fed1:9b0, 2400:8907::f03c:94ff:fed1:9ab, 2400:8907::f03c:94ff:fed1:96d, 2400:8907::f03c:94ff:fe4f:7d0b

  • EU:,,,,,,,,,,,,,,,,,,,,,, 2a01:4f8:10b:3d1b::, 2a01:4f8:231:2ac9::, 2a01:4f8:251:53df::, 2a01:4f8:261:1254::, 2a01:4f8:261:1257::, 2a01:4f8:261:1262::, 2a01:4f8:261:1280::, 2a01:4f8:261:1296::, 2a01:4f8:261:129f::, 2a01:4f8:c010:9ef1::, 2a01:7e00::f03c:93ff:fe22:23c8, 2a01:7e00::f03c:93ff:fe22:2372, 2a01:4f8:c17:ef62::, 2a01:4f9:2b:1b6e::,,, 2a01:4f8:2200:346e::, 2a01:7e01::f03c:94ff:fe03:c4e1, 2a01:7e01::f03c:94ff:fe03:c4f3, 2a01:4f8:c010:9390::1, 2a01:4f8:c012:8a9f::1, 2a01:7e00::f03c:94ff:fed1:d8c5, 2a01:7e00::f03c:94ff:fed1:d8a3, 2a01:4f8:c012:e1b::1, 2a01:4f8:c012:25a4::1, 2a01:7e00::f03c:94ff:fe4f:f63

  • US:,,,,,,,,,, 2600:3c00::f03c:92ff:feaa:0335, 2600:3c00::f03c:92ff:feaa:0354, 2600:3c02::f03c:92ff:feba:b84a, 2600:3c02::f03c:92ff:feba:d761,,, 2600:3c00::f03c:94ff:fed1:f5e4, 2600:3c00::f03c:94ff:fed1:f552, 2600:3c02::f03c:94ff:fed1:3dd2, 2600:3c02::f03c:94ff:fed1:3df5, 2600:3c00::f03c:94ff:fe4f:da1, 2600:3c02::f03c:94ff:fe4f:eb49

You can find the list of our IPs also at

What DNS does Uptime use?

We rely on a combination of Google DNS and Cloudflare DNS:,,,

What countries does Uptime support?

We support phone call alerts to the following countries:

American Samoa, Andorra, Australia, Austria, Belgium, Bosnia and Herzegovina, Brazil, Bulgaria, Canada, Cook Islands, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Faroe Islands, Fiji, Finland, France, Germany, Gibraltar, Greece, Guam, Holy See, Hong Kong, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Japan, Jordan, Kosovo, Republic of, Latvia, Liechtenstein, Lithuania, Luxembourg, Malaysia, Malta, Mauritius, Mexico, Moldova (Republic of), Monaco, Montenegro, Netherlands, New Caledonia, New Zealand, Norway, Palestine, State of, Panama, Papua New Guinea, Philippines, Poland, Portugal, QY, Qatar, Romania, Saint Kitts and Nevis, Saint Lucia, San Marino, Serbia, Singapore, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Taiwan, Thailand, Turkey, Ukraine, United Arab Emirates, United Kingdom, United States of America, Viet Nam, Virgin Islands (British), and Virgin Islands (U.S.)

Are you based in another country? Let us know at

Why is my site down? (SSL error)

Your SSL certificate chain might not be configured correctly. While modern browsers tolerate this, it can cause problems with the older ones.

We recommend using the validator to identify the issue.

You can, however, also disable SSL validation in the advanced settings of your monitor.

Any other questions?

You can always reach us at

We'll get back to you as soon as we can, typically within a few hours.

🙏 Thank you!