HetrixTools: IPs & Locations
Verified HetrixTools IP Addresses. Copy-Paste Firewall-Setups.
Every official HetrixTools monitoring IP: verified in real-time against the canonical source, featuring ready-to-use firewall templates. Stop false downtime alerts caused by blocked checking nodes on your infrastructure.
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103 IPv4 addresses: one click below copies everything as a plain list or as ready-to-paste UFW, nginx, or Apache config.
Add every address to your allow list: UFW, nginx, Apache, or a Cloudflare/WAF skip rule. Partial lists cause flapping checks and false alerts.
HetrixTools updates its list occasionally. This page was verified on 2026-06-12 against the official source. Re-check after unexplained alerts or automate the sync.
Official HetrixTools Monitoring IPs
HetrixTools publishes its uptime monitoring agents at hetrixtools.com/resources/uptime-monitor-ips.txt.
HetrixTools provides uptime monitoring and blacklist monitoring, popular with hosting providers and server admins. Uptime checks are performed by a large fleet of monitoring agents whose IPv4 addresses are published in an official text file.
If your firewall blocks some agents, HetrixTools may record outages that never affected real users. Whitelist the full list below; the agents identify themselves with a HetrixTools user agent.
This list contains 103 IPv4 addresses, verified against the official source on 2026-06-12.
IPv4 addresses 103
- 52.207.41.187
- 96.126.106.201
- 52.23.120.125
- 138.197.17.201
- 66.165.247.154
- 149.28.50.248
- 172.241.23.225
- 209.222.107.178
- 67.213.120.27
- 94.154.159.133
- 66.206.13.170
- 79.127.243.80
- 23.239.7.4
- 52.52.33.209
- 149.28.212.239
- 159.89.159.134
- 66.165.225.34
- 23.106.180.172
- 69.67.149.243
- 77.247.126.141
- 104.194.8.169
- 172.235.62.113
- 66.42.97.101
- 95.179.139.97
- 51.15.61.222
- 188.166.79.172
- 37.48.96.90
- 194.126.173.238
- 51.158.156.63
- 194.49.53.65
- 217.195.155.50
- 52.56.73.124
- 139.162.228.62
- 95.179.193.59
- 178.62.11.90
- 51.195.149.151
- 23.106.61.94
- 185.174.110.102
- 103.50.32.15
- 94.72.181.90
- 185.38.148.144
- 51.89.144.57
- 52.59.92.96
- 78.46.88.58
- 94.16.112.18
- 51.195.46.219
- 178.162.208.86
- 192.248.181.140
- 91.239.130.97
- 66.206.25.250
- 164.92.161.215
- 172.105.249.219
- 152.53.124.134
- 51.89.47.4
- 52.221.91.160
- 139.162.22.205
- 128.199.187.77
- 45.76.150.238
- 51.79.156.91
- 23.106.120.205
- 107.155.75.66
- 210.16.67.82
- 51.79.212.229
- 104.237.139.48
- 45.32.204.172
- 23.227.169.50
- 172.241.24.83
- 2.56.188.250
- 207.188.6.20
- 121.127.40.34
- 52.65.182.14
- 45.76.120.140
- 139.99.169.250
- 172.105.168.58
- 103.101.130.73
- 203.96.179.194
- 91.242.215.225
- 139.99.233.44
- 52.67.204.189
- 104.41.61.219
- 103.88.233.41
- 216.238.100.86
- 189.1.173.35
- 45.158.39.210
- 52.199.17.123
- 45.76.202.144
- 172.104.99.63
- 23.106.230.203
- 43.230.163.178
- 199.254.199.6
- 35.154.5.38
- 148.113.2.135
- 172.105.37.103
- 181.41.142.138
- 65.20.70.55
- 181.41.142.170
- 148.113.25.248
- 146.59.0.13
- 70.34.249.133
- 84.17.55.195
- 151.115.123.218
- 51.38.143.147
- 70.34.248.245
Last verified: 2026-06-12
Official source: https://docs.hetrixtools.com/uptime-monitoring-ip-addresses/
Whitelisting HetrixTools-Monitoring IPs
Pick a format. The block below contains the complete config for every address in the list above. The plain list is also available as a .txt download.
ufw allow from 52.207.41.187 ufw allow from 96.126.106.201 ufw allow from 52.23.120.125 ufw allow from 138.197.17.201 ufw allow from 66.165.247.154 ufw allow from 149.28.50.248 ufw allow from 172.241.23.225 ufw allow from 209.222.107.178 ufw allow from 67.213.120.27 ufw allow from 94.154.159.133 ufw allow from 66.206.13.170 ufw allow from 79.127.243.80 ufw allow from 23.239.7.4 ufw allow from 52.52.33.209 ufw allow from 149.28.212.239 ufw allow from 159.89.159.134 ufw allow from 66.165.225.34 ufw allow from 23.106.180.172 ufw allow from 69.67.149.243 ufw allow from 77.247.126.141 ufw allow from 104.194.8.169 ufw allow from 172.235.62.113 ufw allow from 66.42.97.101 ufw allow from 95.179.139.97 ufw allow from 51.15.61.222 ufw allow from 188.166.79.172 ufw allow from 37.48.96.90 ufw allow from 194.126.173.238 ufw allow from 51.158.156.63 ufw allow from 194.49.53.65 ufw allow from 217.195.155.50 ufw allow from 52.56.73.124 ufw allow from 139.162.228.62 ufw allow from 95.179.193.59 ufw allow from 178.62.11.90 ufw allow from 51.195.149.151 ufw allow from 23.106.61.94 ufw allow from 185.174.110.102 ufw allow from 103.50.32.15 ufw allow from 94.72.181.90 ufw allow from 185.38.148.144 ufw allow from 51.89.144.57 ufw allow from 52.59.92.96 ufw allow from 78.46.88.58 ufw allow from 94.16.112.18 ufw allow from 51.195.46.219 ufw allow from 178.162.208.86 ufw allow from 192.248.181.140 ufw allow from 91.239.130.97 ufw allow from 66.206.25.250 ufw allow from 164.92.161.215 ufw allow from 172.105.249.219 ufw allow from 152.53.124.134 ufw allow from 51.89.47.4 ufw allow from 52.221.91.160 ufw allow from 139.162.22.205 ufw allow from 128.199.187.77 ufw allow from 45.76.150.238 ufw allow from 51.79.156.91 ufw allow from 23.106.120.205 ufw allow from 107.155.75.66 ufw allow from 210.16.67.82 ufw allow from 51.79.212.229 ufw allow from 104.237.139.48 ufw allow from 45.32.204.172 ufw allow from 23.227.169.50 ufw allow from 172.241.24.83 ufw allow from 2.56.188.250 ufw allow from 207.188.6.20 ufw allow from 121.127.40.34 ufw allow from 52.65.182.14 ufw allow from 45.76.120.140 ufw allow from 139.99.169.250 ufw allow from 172.105.168.58 ufw allow from 103.101.130.73 ufw allow from 203.96.179.194 ufw allow from 91.242.215.225 ufw allow from 139.99.233.44 ufw allow from 52.67.204.189 ufw allow from 104.41.61.219 ufw allow from 103.88.233.41 ufw allow from 216.238.100.86 ufw allow from 189.1.173.35 ufw allow from 45.158.39.210 ufw allow from 52.199.17.123 ufw allow from 45.76.202.144 ufw allow from 172.104.99.63 ufw allow from 23.106.230.203 ufw allow from 43.230.163.178 ufw allow from 199.254.199.6 ufw allow from 35.154.5.38 ufw allow from 148.113.2.135 ufw allow from 172.105.37.103 ufw allow from 181.41.142.138 ufw allow from 65.20.70.55 ufw allow from 181.41.142.170 ufw allow from 148.113.25.248 ufw allow from 146.59.0.13 ufw allow from 70.34.249.133 ufw allow from 84.17.55.195 ufw allow from 151.115.123.218 ufw allow from 51.38.143.147 ufw allow from 70.34.248.245
Cloudflare / WAF: create an IP Access Rule (or custom WAF skip rule) with action Allow for the addresses above, so bot fight mode and managed challenges never block probe traffic.
Whitelisting only exempts these addresses from blocking and rate-limiting rules. It grants no access beyond what your site already serves publicly.
Frequently Asked Questions
The official list at hetrixtools.com/resources/uptime-monitor-ips.txt is kept current and is designed to be consumed by automation. Re-sync it periodically. Agents are occasionally added or replaced.
The official uptime monitoring list is IPv4-only. Check the HetrixTools documentation for current IPv6 capabilities.
Uptime checks identify themselves with a user agent containing "HetrixTools". Use it for log analysis, but enforce allow rules by IP address.
Both: wherever requests can be blocked. If your site sits behind a CDN or WAF (Cloudflare, AWS WAF, Akamai…), add an allow/skip rule there so probes are never challenged; if your origin firewall also filters traffic, whitelist them there too. A single missed layer is enough to cause false alerts.
Most providers expose a machine-readable source (linked above). Fetch it on a schedule, a small cron job that pulls the list and updates your firewall ruleset, instead of hardcoding addresses by hand. This page is re-verified against the official source regularly, but automation on your side is the most reliable option.
No. Allow-listing only exempts known monitoring addresses from blocking and rate-limiting rules. It grants no access beyond what your site already serves publicly, and authentication, authorization, and TLS are unchanged. You are simply telling your firewall "these are not attackers".
A blocklist keeps known-bad addresses out; an allow/whitelist makes sure known-good addresses, here, the monitoring probes, never end up caught in a block or rate-limit rule. The two coexist: you keep blocking attackers while explicitly exempting the probes.
The IP addresses on this page belong to HetrixTools and are published by HetrixTools for whitelisting purposes. List verified on 2026-06-12 against the official source. Always cross-check with the official documentation before locking down production firewalls. All product names and trademarks are the property of their respective owners; Uptimeify is not affiliated with HetrixTools. Uptimeify's own worker IPs are published at /ips.txt; a feature comparison is on our comparison page.
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