Site Name URL Description
AbuseIPDB https://www.abuseipdb.com A central blacklist for webmasters, system administrators, and other interested parties to report and find IP addresses that have been associated with malicious activity online.
Cisco Talos https://www.talosintelligence.com Various intelligence on IPs, domains etc.
IPaddressguide https://www.ipaddressguide.com Free IP address and other Internet related tools.
IPcalc https://jodies.de/ipcalc Takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range.
IPinfo https://ipinfo.io IP geolocation, company, carrier and IP type data sets.
IPvoid https://www.ipvoid.com A range of IP address tools to discover details about IP addresses. IP blacklist check, whois lookup, dns lookup, ping etc.
Ifconfig.me https://ifconfig.me/ An online tool to get your public IP address.
NetworksDB https://networksdb.io Information about the public IPv4 and IPv6 addresses, networks and domains owned by companies and organization's across the world along with city-level IP geolocation data and autonomous system information.
Project Honey Pot https://www.projecthoneypot.org List of comprised and Malicious IPs and other data.