Doesn't Checkly run on dynamic AWS IPs?

Checks run in AWS regions, but Checkly routes them through published static egress IPs exactly so customers can whitelist them. The official API endpoints always reflect the current fleet.

Does Checkly support IPv6?

Yes — the /v1/static-ipv6s endpoint publishes IPv6 /56 ranges per region. Whitelist both lists for dual-stacked infrastructure.

How often do the Checkly IPs change?

The static IP lists are stable by design, but regions get added over time. Re-sync the API endpoints periodically or automate the check.

What happens if I block a Checkly address?

Checks from the affected region fail or hit bot challenges, producing false alerts and broken check results. Whitelisting the full list keeps results consistent across regions.

Should I whitelist these IPs on my origin server or my CDN/WAF?

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.

How do I keep this whitelist up to date automatically?

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.

Does whitelisting these IPs make my site less secure?

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".

What is the difference between whitelisting and blocking here?

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.

Checkly: IPs & Locations

Verified Checkly IP Addresses. Copy-Paste Firewall-Setups.

Every official Checkly 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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Three-Step Activation & Frictionless Firewall Alignment

Bring your perimeter security rules up to date in three simple steps. Our production-ready configuration templates for common server architectures eliminate fragmented routing filters and costly check flapping.

Copy Complete IP Bundles

157 IPv4 and 34 IPv6 addresses — one click below copies everything as a plain list or as ready-to-paste UFW, nginx, or Apache config.

Authorize Firewall & WAF Layers

Add every address to your allow list — UFW, nginx, Apache, or a Cloudflare/WAF skip rule. Partial lists cause flapping checks and false alerts.

Re-Sync Periodically

Checkly 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 Checkly Monitoring IPs

Checkly publishes machine-readable lists at api.checklyhq.com/v1/static-ips (IPv4) and /v1/static-ipv6s (IPv6 ranges).

Checkly is a developer-first synthetic monitoring platform — Playwright-based browser checks and API checks running from AWS regions around the world. Checks egress through published static IP addresses, so you can whitelist Checkly traffic reliably.

If your firewall or WAF blocks these addresses, checks fail or get challenged even though your site is healthy. Whitelist the complete lists below; the IPv6 entries are /56 ranges and can be pasted into firewalls as-is.

This list contains 157 IPv4 and 34 IPv6 addresses, verified against the official source on 2026-06-12.

IPv4 addresses 157

3.6.20.243
3.17.106.146
3.34.12.129
3.37.59.136
3.74.107.228
3.78.155.165
3.98.215.170
3.109.106.92
3.109.109.177
3.109.167.65
3.114.75.140
3.125.108.148
3.134.230.82
3.134.239.96
3.143.128.19
3.211.217.48
3.255.54.55
13.36.226.230
13.39.3.231
13.39.232.43
13.39.236.84
13.43.156.224
13.48.162.54
13.52.93.107
13.54.45.181
13.55.213.62
13.113.60.181
13.208.82.239
13.209.34.65
13.209.211.14
13.211.27.92
13.214.117.85
13.228.244.82
13.237.8.239
13.238.60.37
13.244.136.126
13.244.236.0
13.245.106.43
13.245.148.249
13.246.130.231
13.247.30.251
15.152.103.65
15.152.125.107
15.156.126.181
15.157.99.108
15.157.101.15
15.161.180.124
15.164.121.38
15.164.200.158
15.168.5.169
15.168.45.240
15.168.106.208
15.184.22.185
15.184.252.133
15.185.92.84
15.185.104.229
15.185.156.205
15.188.122.137
15.207.219.98
15.229.56.35
16.162.201.45
16.163.4.182
16.163.237.192
16.170.38.94
18.102.35.213
18.102.39.196
18.102.46.79
18.102.59.137
18.102.92.39
18.132.86.84
18.134.149.153
18.134.201.213
18.135.179.55
18.163.68.67
18.166.1.159
18.177.47.156
18.177.64.19
18.177.131.104
18.184.0.56
18.188.44.71
18.193.141.226
18.197.172.39
18.223.8.66
18.229.243.24
18.230.50.229
23.19.45.129
23.19.59.129
23.19.66.245
23.19.66.246
23.106.239.101
23.106.239.174
34.209.2.129
34.215.165.113
34.230.212.244
34.242.17.159
34.246.74.139
34.246.204.133
35.176.249.175
35.180.153.150
43.199.11.165
43.202.173.18
43.202.219.81
43.218.8.168
43.218.19.251
43.218.154.173
43.218.202.200
43.218.237.62
43.218.250.173
44.206.103.147
44.210.168.97
44.221.164.148
44.221.215.176
44.235.44.60
44.237.79.79
44.240.116.205
51.20.29.65
51.20.153.4
51.20.158.132
51.21.16.250
52.8.167.200
52.22.78.31
52.36.214.162
52.42.153.190
52.60.138.202
52.60.240.255
52.71.172.74
52.74.182.121
52.201.210.118
52.212.195.72
52.220.40.195
54.94.0.175
54.146.26.208
54.151.146.209
54.161.245.122
54.164.9.242
54.177.183.174
54.186.86.230
54.195.90.61
54.207.45.193
54.233.84.10
54.241.196.177
54.252.49.95
57.180.166.209
65.0.112.148
122.248.238.187
157.241.93.172
84.16.252.216
84.16.252.217
84.16.252.218
84.16.252.219
84.16.252.220
84.16.252.221
84.16.252.222
84.16.252.223
173.208.3.141
209.50.250.199
209.50.250.200

IPv6 addresses 34

2406:da11:e9f:a800::/56
2406:da12:940:c700::/56
2406:da14:8e6:8700::/56
2406:da16:422:8400::/56
2406:da18:51c:e500::/56
2406:da19:772:2100::/56
2406:da1a:ec4:6100::/56
2406:da1c:a54:1c00::/56
2406:da1e:f19:b000::/56
2600:1f11:c05:aa00::/56
2600:1f14:3144:5c00::/56
2600:1f16:1971:eb00::/56
2600:1f18:12ca:3000::/56
2607:f5b7:1:135:5::/112
2607:f5b7:3:e:1::/112
2607:f5b7:3:e:2::/112
2600:1f1c:95e:a400::/56
2607:f5b4:1:1c:2::/112
2607:f5b4:1:12:c::/112
2607:f5b4:1:12:d::/112
2600:1f1e:d01:6d00::/56
2a05:d012:4ab:2200::/56
2a05:d014:ed3:f100::/56
2a05:d016:407:6600::/56
2a05:d018:6a0:af00::/56
2a05:d01a:d6a:3100::/56
2a05:d01c:b4b:c00::/56
2a0d:3003:b666:a005:7::/112
2a0d:3003:b666:a006:12::/112
2a0d:3003:b666:a00a:2::/112
2a05:d01e:364:c000::/56
2a00:c98:4007:20:1::/112
2a00:c98:4007:21:1::/112
2a00:c98:4007:22:3::/112

Last verified: 2026-06-12

Official source: https://api.checklyhq.com/v1/static-ips

Whitelisting Checkly-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 3.6.20.243
ufw allow from 3.17.106.146
ufw allow from 3.34.12.129
ufw allow from 3.37.59.136
ufw allow from 3.74.107.228
ufw allow from 3.78.155.165
ufw allow from 3.98.215.170
ufw allow from 3.109.106.92
ufw allow from 3.109.109.177
ufw allow from 3.109.167.65
ufw allow from 3.114.75.140
ufw allow from 3.125.108.148
ufw allow from 3.134.230.82
ufw allow from 3.134.239.96
ufw allow from 3.143.128.19
ufw allow from 3.211.217.48
ufw allow from 3.255.54.55
ufw allow from 13.36.226.230
ufw allow from 13.39.3.231
ufw allow from 13.39.232.43
ufw allow from 13.39.236.84
ufw allow from 13.43.156.224
ufw allow from 13.48.162.54
ufw allow from 13.52.93.107
ufw allow from 13.54.45.181
ufw allow from 13.55.213.62
ufw allow from 13.113.60.181
ufw allow from 13.208.82.239
ufw allow from 13.209.34.65
ufw allow from 13.209.211.14
ufw allow from 13.211.27.92
ufw allow from 13.214.117.85
ufw allow from 13.228.244.82
ufw allow from 13.237.8.239
ufw allow from 13.238.60.37
ufw allow from 13.244.136.126
ufw allow from 13.244.236.0
ufw allow from 13.245.106.43
ufw allow from 13.245.148.249
ufw allow from 13.246.130.231
ufw allow from 13.247.30.251
ufw allow from 15.152.103.65
ufw allow from 15.152.125.107
ufw allow from 15.156.126.181
ufw allow from 15.157.99.108
ufw allow from 15.157.101.15
ufw allow from 15.161.180.124
ufw allow from 15.164.121.38
ufw allow from 15.164.200.158
ufw allow from 15.168.5.169
ufw allow from 15.168.45.240
ufw allow from 15.168.106.208
ufw allow from 15.184.22.185
ufw allow from 15.184.252.133
ufw allow from 15.185.92.84
ufw allow from 15.185.104.229
ufw allow from 15.185.156.205
ufw allow from 15.188.122.137
ufw allow from 15.207.219.98
ufw allow from 15.229.56.35
ufw allow from 16.162.201.45
ufw allow from 16.163.4.182
ufw allow from 16.163.237.192
ufw allow from 16.170.38.94
ufw allow from 18.102.35.213
ufw allow from 18.102.39.196
ufw allow from 18.102.46.79
ufw allow from 18.102.59.137
ufw allow from 18.102.92.39
ufw allow from 18.132.86.84
ufw allow from 18.134.149.153
ufw allow from 18.134.201.213
ufw allow from 18.135.179.55
ufw allow from 18.163.68.67
ufw allow from 18.166.1.159
ufw allow from 18.177.47.156
ufw allow from 18.177.64.19
ufw allow from 18.177.131.104
ufw allow from 18.184.0.56
ufw allow from 18.188.44.71
ufw allow from 18.193.141.226
ufw allow from 18.197.172.39
ufw allow from 18.223.8.66
ufw allow from 18.229.243.24
ufw allow from 18.230.50.229
ufw allow from 23.19.45.129
ufw allow from 23.19.59.129
ufw allow from 23.19.66.245
ufw allow from 23.19.66.246
ufw allow from 23.106.239.101
ufw allow from 23.106.239.174
ufw allow from 34.209.2.129
ufw allow from 34.215.165.113
ufw allow from 34.230.212.244
ufw allow from 34.242.17.159
ufw allow from 34.246.74.139
ufw allow from 34.246.204.133
ufw allow from 35.176.249.175
ufw allow from 35.180.153.150
ufw allow from 43.199.11.165
ufw allow from 43.202.173.18
ufw allow from 43.202.219.81
ufw allow from 43.218.8.168
ufw allow from 43.218.19.251
ufw allow from 43.218.154.173
ufw allow from 43.218.202.200
ufw allow from 43.218.237.62
ufw allow from 43.218.250.173
ufw allow from 44.206.103.147
ufw allow from 44.210.168.97
ufw allow from 44.221.164.148
ufw allow from 44.221.215.176
ufw allow from 44.235.44.60
ufw allow from 44.237.79.79
ufw allow from 44.240.116.205
ufw allow from 51.20.29.65
ufw allow from 51.20.153.4
ufw allow from 51.20.158.132
ufw allow from 51.21.16.250
ufw allow from 52.8.167.200
ufw allow from 52.22.78.31
ufw allow from 52.36.214.162
ufw allow from 52.42.153.190
ufw allow from 52.60.138.202
ufw allow from 52.60.240.255
ufw allow from 52.71.172.74
ufw allow from 52.74.182.121
ufw allow from 52.201.210.118
ufw allow from 52.212.195.72
ufw allow from 52.220.40.195
ufw allow from 54.94.0.175
ufw allow from 54.146.26.208
ufw allow from 54.151.146.209
ufw allow from 54.161.245.122
ufw allow from 54.164.9.242
ufw allow from 54.177.183.174
ufw allow from 54.186.86.230
ufw allow from 54.195.90.61
ufw allow from 54.207.45.193
ufw allow from 54.233.84.10
ufw allow from 54.241.196.177
ufw allow from 54.252.49.95
ufw allow from 57.180.166.209
ufw allow from 65.0.112.148
ufw allow from 122.248.238.187
ufw allow from 157.241.93.172
ufw allow from 84.16.252.216
ufw allow from 84.16.252.217
ufw allow from 84.16.252.218
ufw allow from 84.16.252.219
ufw allow from 84.16.252.220
ufw allow from 84.16.252.221
ufw allow from 84.16.252.222
ufw allow from 84.16.252.223
ufw allow from 173.208.3.141
ufw allow from 209.50.250.199
ufw allow from 209.50.250.200
ufw allow from 2406:da11:e9f:a800::/56
ufw allow from 2406:da12:940:c700::/56
ufw allow from 2406:da14:8e6:8700::/56
ufw allow from 2406:da16:422:8400::/56
ufw allow from 2406:da18:51c:e500::/56
ufw allow from 2406:da19:772:2100::/56
ufw allow from 2406:da1a:ec4:6100::/56
ufw allow from 2406:da1c:a54:1c00::/56
ufw allow from 2406:da1e:f19:b000::/56
ufw allow from 2600:1f11:c05:aa00::/56
ufw allow from 2600:1f14:3144:5c00::/56
ufw allow from 2600:1f16:1971:eb00::/56
ufw allow from 2600:1f18:12ca:3000::/56
ufw allow from 2607:f5b7:1:135:5::/112
ufw allow from 2607:f5b7:3:e:1::/112
ufw allow from 2607:f5b7:3:e:2::/112
ufw allow from 2600:1f1c:95e:a400::/56
ufw allow from 2607:f5b4:1:1c:2::/112
ufw allow from 2607:f5b4:1:12:c::/112
ufw allow from 2607:f5b4:1:12:d::/112
ufw allow from 2600:1f1e:d01:6d00::/56
ufw allow from 2a05:d012:4ab:2200::/56
ufw allow from 2a05:d014:ed3:f100::/56
ufw allow from 2a05:d016:407:6600::/56
ufw allow from 2a05:d018:6a0:af00::/56
ufw allow from 2a05:d01a:d6a:3100::/56
ufw allow from 2a05:d01c:b4b:c00::/56
ufw allow from 2a0d:3003:b666:a005:7::/112
ufw allow from 2a0d:3003:b666:a006:12::/112
ufw allow from 2a0d:3003:b666:a00a:2::/112
ufw allow from 2a05:d01e:364:c000::/56
ufw allow from 2a00:c98:4007:20:1::/112
ufw allow from 2a00:c98:4007:21:1::/112
ufw allow from 2a00:c98:4007:22:3::/112

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.

FAQ

Frequently Asked Questions

The IP addresses on this page belong to Checkly and are published by Checkly 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 Checkly. Uptimeify's own worker IPs are published at /ips.txt; a feature comparison is on our comparison page.

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