IP Addresses

All outgoing requests from WatchCron originate from the IP addresses listed below. This includes uptime monitoring checks, Cloud Cron executions, and webhook scheduler requests.

If your server uses a firewall, add these addresses to your allowlist so WatchCron can reach your endpoints.

IPv4

IPv6

Machine-readable endpoints

For automated firewall configuration:

• /ips.txt — plain text, one IP per line
• /ips.json — JSON with ipv4 and ipv6 arrays

User-Agent

Requests from WatchCron use the following User-Agent strings:

• WatchCron/1.0 — uptime checks, port checks, SSL checks
• WatchCron Cloud Cron/1.0 — Cloud Cron and webhook scheduler requests

Note: This list is updated whenever our infrastructure changes. We recommend checking /ips.json periodically from your firewall scripts.