Which blacklists do you check?
We check against 50+ major blacklists including Spamhaus (SBL, XBL, PBL), Barracuda, SORBS, SpamCop, UCEPROTECT, Invaluement, and other DNS-based blocklists (DNSBLs) used by email providers and security tools.
What are inbound vs outbound blocklists?
Inbound blocklists contain IPs known for spam, scanning, and brute-force attacks (threats coming TO you). Outbound blocklists contain known malicious destinations like C2 servers and malware hosts (threats your systems might connect TO).
Why is my IP blacklisted?
IPs get blacklisted for spam, malware distribution, being part of a botnet, or sending unsolicited traffic. Shared hosting and VPS IPs are often listed due to other users' actions.
How do I get removed from a blacklist?
Each blacklist has its own delisting process. Identify which list you are on and contact them directly. Most require stopping the offending behavior and requesting removal through their website.
How often are blocklists updated?
Our blocklists are updated multiple times daily to ensure accurate threat intelligence. The API queries our updated database when you make a request.
Can I monitor my IP continuously?
Yes! Set up scheduled API calls to monitor your mail server or critical IPs. Alert when an IP appears on blocklists. Our plans support the polling frequency you need.
Does this affect email deliverability?
Yes. Major email providers check blocklists when receiving mail. If your sending IP is listed on inbound threat lists, emails may be rejected or sent to spam. Regular monitoring helps maintain deliverability.
What is the ipDetails field?
With premium plans, you also get geolocation details for the IP address including country, region, and other location data. This helps identify where threats are originating from.
Can I check outbound connections?
Yes! Check if destination IPs are on outbound blocklists to detect if your systems are trying to connect to known malicious servers (potential compromise indicator).
