• IP Lookup Geolocation API - eXTReMe-IP-Lookup.com. It seems to me that this API is very generous for its free offering, as the limit on the website is 10000 requests per month. This WP plugin uses it.

Research: Fraud Prevention, IP Geolocation and Public Datasets

Proxy Detection Database, Email Address Verification, Phone Number Validation, Device fingerprinting

Open Datasets

• IP2Proxy Proxy Detection Database
  The IP2Proxy database has a list of IPs used for anonymous browsing and IP address hiding. And there are free lite versions: IP2Proxy LITE Database

• MaxMind
  also has Proxy Detection Database GeoIP2 Anonymous IP Amazing: minFraud, Flag suspicious email addresses, and everything else

• Proxy Detection Database | Identify VPNs, Bots, & Tor Connections Phone Number Validator Lookup: Phone Number Validation

Proxy Detection

Prevent & Block Proxies & VPNs

• Proxy IP Check
• IP2Proxy Proxy VPN Detection - Check Proxy & VPN using IP Address

Email Address Verification

• Email Verifier Check
• Email Validation API - Verify Email Address | MailboxValidator

Phone Number Validation

Device fingerprinting

Track users even as they switch their browser and IP address.

• My Device ID: ee71331cae5a9f0a3e47800cc7b52b7f Device Fingerprinting | Device Fingerprint Fraud Detection | Bot Fingerprint

Open Datasets

World Cities Database

• World Cities Database Has also: Neighboring Countries Web Service Location Search To Nearest City

• World Cities Database | Simplemaps.com

Public Datasets

• awesomedata/awesome-public-datasets: A topic-centric list of HQ open datasets.

• Data Dumps  |  Freebase API (Deprecated)

Open Data Portals

Comprehensive List of Open Data Portals from Around the World: Data Portals

WOOW: Dataset Search

Pa tako sam pronašao: Geonames - All Cities with a population > 1000 — Opendatasoft

Serbia?

• Open Data Hub NOVOSTI - ODH

• Serbian Open Data Portal Interesantan je Polen API, zatim Adresni registar (sve adrese u Serbiji)

• Otvoreni podaci - Republički zavod za statistiku Srbije Svi skupovi podataka su dostupni i na Nacionalnom portalu otvorenih podataka data.gov.rs.

Fraud Detection & Prevention Solution To Reduce Chargeback Free Phone Number Validation Tool | TelValidator

Simplemaps: World Cities Database World Major City Database | WordCityDB World Major City Database | WordCityDB City-Data.com - Stats about all US cities - real estate, relocation info, crime, house prices, cost of living, races, home value estimator, recent sales, income, photos, schools, maps, weather, neighborhoods, and more

Find Open Datasets and Machine Learning Projects | Kaggle World cities database | Kaggle

The official portal for European data: Datasets - data.europa.eu

Блог - Отворени подаци Почетак - Отворени подаци

Колаборациона платформа - Алфа тестирање Отворени подаци | Геосрбија Адресни регистар - шифарник (АР) - Отворени подаци

Mape: A3 Geosrbija

WOOW: Google Public Data Explorer WOOW: Dataset Search WOOW: Registry of Open Data on AWS

Free Public Data Sets For Analysis | Tableau

Sprski, odličan:

Geonames - All Cities with a population > 1000 — Opendatasoft

All Postal Code - All countries (Geonames) — Opendatasoft

10 Great Places To Find Open, Free Datasets [2023 Guide]

Free IP Geolocation API and Accurate IP Geolocation Database