Running a basic background check for a website.
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https://whois.domaintools.com / http://www.crimeflare.org:82 / https://www.findip-address.com / https://iphostinfo.com/cloudflare — IP or domain name information. The one in the middle gets through the CloudFlare defense. The last one will do the same and also provide a list of subdomains. https://whoisrequest.com/history/ will provide a history of changes made with the DNS records.
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tracert [IP/domain name] (Windows) or traceroute [IP/domain name] (Linux) — the path each packet takes to get to the destination.
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nslookup [IP/domain name] — DNS lookup.
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https://web.archive.org/ — old versions of the website.
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https://pentest-tools.com/website-vulnerability-scanning/discover-hidden-directories-and-files; DirBuster — open directories that may not have been mentioned anywhere on the website.
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nmap — port information for the server hosting a website.
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https://www.shodan.io/ — can be useful if used the right way.
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https://ubersuggest.io/ — use this to find sites/links regarding your search term.
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https://www.sixdegreesofwikipedia.com — find links quickly.
Running a basic background check for an entity or a person.
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https://opencorpdata.com/ — not much but at least something.
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The police department responsible for the jurisdiction in which the incident occurred/city in which the incident occurred =protocol for requesting and receiving police reports. Requires to deanonimize oneself.
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https://policereports.lexisnexis.com/search/ — Accident Reports.
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https://www.beenverified.com/ — background checks and public records. Costs money.
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https://www.mylife.com — what is the Internet's opinion about somebody. Similar principle as above.
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https://www.accurint.com/ — locate-and-research tool that will have to be paid for.
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http://www.data-trac.com/ — same as above.
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https://legal.thomsonreuters.com/en/products/clear-investigation-software — Thomson Reuter's research tool for journalists.
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https://www.pacer.gov/ — Public Access to Court Electronic Records.
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https://www.canlii.org — same but Canadian. Some features cost money.
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https://www.fbi.gov/services/cjis/nics — FBI's National Instant Criminal Background Check System. Requires to deanonymize oneself. Includes mental health and criminal entries.
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Try to google "Department of Finance notice of [property] value", some cities/states have information on the Web about this.
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Check for official statements on https://www.justice.gov/ and https://www.house.gov/.
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https://www.courtlistener.com — database of legal opinions from courts.
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https://www.sec.gov/ — US Securities and Exchange Commission.
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https://issuu.com, https://www.newspapers.com — people publish magazines and other printed stuff here.
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https://beta.companieshouse.gov.uk, https://opengovuk.com/ — similar to OpenCorpData.
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https://www.courtlistener.com/ — find court cases.