Reputation Checker

The Untangled Labs Reputation Checker assesses the security reputation of any domain or IP address. Checks include reverse DNS (PTR) lookup, email authentication (SPF, DMARC) presence, domain age and registration history, and blacklist status against common DNS blocklists. Use it to evaluate the trustworthiness of external senders, investigate suspicious sources, or audit your own IP and domain reputation. Free, no account required.