--- type: Index title: "Website and Domain Monitoring for Small Businesses | ostr.io" description: "Monitor website behavior and get email and SMS alerts for important domain, WHOIS, DNS, and SSL/TLS changes with free ostr.io WebSec. Try free, pay as you go." resource: "https://domain-protection.info/" tags: [domain monitoring, website monitoring, ostr-io] timestamp: 2026-05-27T00:00:00Z --- # Know when your site fails. Know when your domain changes. Monitor website behavior and get email and SMS alerts for important domain, WHOIS, DNS, and SSL/TLS changes with free ostr.io WebSec. Try free, pay as you go. ## About this bundle This is an Open Knowledge Format (OKF) v0.1 bundle: a portable, agent-readable directory of markdown concepts generated from this site's own page metadata. One concept is one file, and concepts link to each other with normal markdown links. The bundle complements the site's llms.txt, JSON-LD, and sitemap, and is generated from the same source so they cannot drift. Spec: https://github.com/GoogleCloudPlatform/knowledge-catalog/tree/main/okf ## Verified claims - ostr.io WebSec monitors WHOIS, DNS, and SSL/TLS records and can alert on detected changes. (source: https://ostr.io/info/domain-names-protection, accessed 2026-05-27) - ostr.io monitoring supports HTTP(S) and SNMP protocols. (source: https://ostr.io/info/monitoring, accessed 2026-05-27) - ostr.io presents monitoring setup as one-click. (source: https://ostr.io/info/monitoring, accessed 2026-05-27) - WebSec domain monitoring is free for users on all ostr.io plans. (source: https://ostr.io/info/domain-names-protection, accessed 2026-05-27) ## Concepts ### Monitoring Feature - [Monitor the website signals that tell you to investigate](/website-monitoring.md) - Monitor website responses and important changes with ostr.io HTTP(S) checks, set up email and SMS alerts, and investigate unexpected results fast on key pages. - [Know when your domain records change](/domain-monitoring.md) - Detect important WHOIS and DNS record changes with free ostr.io WebSec monitoring, and route email and SMS alerts to the people who can review them quickly. - [Detect DNS record changes and validate them fast](/dns-monitoring.md) - Detect DNS record changes with free ostr.io WebSec monitoring, validate them against your provider, and escalate when a change looks unexpected or unauthorized. - [Watch certificate changes and renew before customers notice](/ssl-certificate-monitoring.md) - Detect SSL/TLS certificate changes and receive expiration reminders with free ostr.io WebSec monitoring, so renewals happen before customers ever notice. - [Get renewal reminders before a domain is due](/domain-expiration-monitoring.md) - Receive domain expiration reminders with free ostr.io WebSec monitoring and keep renewal ownership clear, so a domain registration never lapses by accident. - [SNMP monitoring for servers and hardware](/snmp-monitoring.md) - ostr.io supports SNMP monitoring for server and hardware signals. This page is a concise handoff to the official specialized SNMP properties for setup detail. ### Notifications - [Send alerts to people who can act](/alerts.md) - Choose how monitoring alerts reach you. ostr.io supports email and SMS notifications routed to the people who can investigate website and domain signals. ### Pricing - [Free domain signals. Pay-as-you-go website monitoring.](/pricing.md) - Understand free WebSec domain monitoring and pay-as-you-go ostr.io HTTP(S) website monitoring, then review current official ostr.io pricing before you buy. ### About - [About domain-protection.info](/about.md) - domain-protection.info is an official ostr.io satellite site that explains website and domain monitoring for US small businesses, with a clear evidence policy. ### Guide - [Website monitoring checklist](/guides/website-monitoring-checklist.md) - Choose the website signals and recipients worth watching with this checklist, then add ostr.io HTTP(S) monitoring so unexpected results prompt a fast review. - [Domain monitoring checklist](/guides/domain-monitoring-checklist.md) - Prepare registrar, DNS, and certificate responsibilities before adding free WebSec domain monitoring, so every alert has a clear owner and a fast response. - [Domain expiration checklist](/guides/domain-expiration-checklist.md) - Keep domain renewal ownership and deadlines clear with this checklist, then add free WebSec expiration reminders so a registration never lapses by accident. - [How to respond to a DNS change alert](/guides/respond-to-dns-change-alert.md) - A step-by-step response for a DNS change alert: identify the record, validate it against expected work, and escalate to your DNS provider when needed. - [How to respond to an SSL expiration alert](/guides/respond-to-ssl-expiration-alert.md) - A step-by-step response for an SSL/TLS expiration alert: find the renewal path, complete or confirm renewal, and verify the live certificate before it expires. ## Bundle files - [Guides overview](/guides/index.md) - [Change log](/log.md) ## Source Generated from domain-protection.info page metadata and a dated ostr.io evidence ledger (verified 2026-05-27). This site describes monitoring, detection, alerts, and reminders only. Claims about ostr.io are limited to the cited public pages, are not confirmed beyond them, and should be re-checked against the current ostr.io interface before reuse.