IP Lookup at ifconfig.me displays the visitor's IP address along with connection details such as user agent, language, referer, method, encoding, MIME type, charset and X-Forwarded-For. It also offers a command line interface for retrieving this information via curl.
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DNSlytics is an online investigation tool for viewing information about IP addresses, domain names and providers. It offers DNS lookups, email testing, WHOIS lookups, and reports on AS/BGP, CIDR and TLD data. Premium website access and a premium API provide additional page views, monitors and data.
RDAP Lookup is a private lookup tool for domain names, IP addresses and Autonomous System Numbers using RDAP, the replacement for Whois. The browser connects directly to the relevant registry's RDAP server over encrypted HTTPS. An optional setting follows the referral to the registrar's RDAP record. The page notes that all generic TLDs support RDAP while only a few ccTLDs have deployed it.
NETworkManager is a free, open-source tool for managing networks and troubleshooting network problems. It includes 28 built-in tools such as an IP scanner, port scanner, ping monitor, DNS lookup, remote desktop and PowerShell in a single interface. It offers profiles for organizing hosts, and no license, subscription or telemetry.