Devion Tools

Domain registration via WHOIS with RDAP fallback

DNS records, ping, OS fingerprint, geolocation, propagation, email auth

HTTP Probe

Headers, SSL/TLS, redirect chain, TTFB, HTTP/2+3, CDN, tech stack, favicon hash

Traceroute

Hop-by-hop network path (may take 15-30 seconds)

Port Scan

Scans 27 common ports (FTP, SSH, HTTP, SMTP, DB, etc.) — only run on domains you own or have permission to test

Check IP against 24 DNS-based blackhole lists

If your IP appears on a blacklist, here's how to fix it:

Identify the root cause — compromised account, misconfigured mail server, open relay, or spam complaints. Fix the underlying issue first.
Request removal from each specific blacklist. Most have a self-service delisting form:
- Spamhaus Blocklist Removal
- SpamCop Delisting (auto-expires 24hrs after last report)
- Barracuda Central Lookup/Removal
Set up proper email authentication — ensure SPF, DKIM, and DMARC records are correctly configured. Use MXToolbox SuperTool for a deep-dive analysis.
Monitor with Google Postmaster Tools — see your domain's reputation with Gmail, spam rate, authentication results, and delivery errors. Essential for anyone sending email at scale.
For Gmail-specific blocks — Google maintains its own reputation system independent of DNSBLs. If Gmail rejects your mail, review your Postmaster dashboard for spam rate spikes and follow their Bulk Sender Guidelines.
Prevent re-listing — set up feedback loops (FBLs) with major providers, keep complaint rates under 0.1%, maintain clean mailing lists.