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IP Lookup

A tool to lookup geographic location, ISP, and organization information of IP addresses in real-time. Essential for security analysis, network debugging, and location-based services!

💡 Common Use Cases

  • Security Analysis: Check suspicious IP addresses
  • Geolocation: Identify user location for content delivery
  • Network Debugging: Verify server locations
  • Access Control: Implement geo-blocking or allowlisting

Key Features​

1. IP Address Lookup​

  • Get country, region, city, and coordinates
  • View ISP and organization information
  • Check timezone and postal code

2. My IP Check​

  • Automatically detect your current public IP
  • One-click lookup of your IP information

3. Google Maps Integration​

  • View IP location on Google Maps
  • Visualize geographic coordinates

Use Cases​

Security Analysis​

# Analyze suspicious access logs
2024-01-15 10:23:45 - Login attempt from 203.0.113.45

# Lookup IP
→ Country: Unknown Region
→ ISP: Suspicious Hosting Provider
→ Action: Block IP

Web Service Localization​

// Provide content based on user IP
async function getLocalization(ip) {
  const ipInfo = await lookupIP(ip);
  
  if (ipInfo.countryCode === 'KR') {
    return { language: 'ko', currency: 'KRW' };
  }
  return { language: 'en', currency: 'USD' };
}

Geo-blocking​

const blockedCountries = ['XX', 'YY'];

async function checkAccess(ip) {
  const ipInfo = await lookupIP(ip);
  return !blockedCountries.includes(ipInfo.countryCode);
}

IP Address Types​

IPv4 vs IPv6​

  • IPv4: 192.168.1.1 (32-bit)
  • IPv6: 2001:0db8:85a3::8a2e:0370:7334 (128-bit)

Public vs Private IP​

Private IP ranges (not lookupable):

  • 10.0.0.0 - 10.255.255.255
  • 172.16.0.0 - 172.31.255.255
  • 192.168.0.0 - 192.168.255.255

Available Information​

FieldDescription
IP AddressThe queried IP address
CountryCountry name and code
RegionState/Province
CityCity name
CoordinatesLatitude and Longitude
ISPInternet Service Provider
OrganizationOrganization name
TimezoneLocal timezone

Tips​

1. Privacy Considerations​

  • IP addresses may be considered personal information
  • Follow GDPR and privacy regulations
  • Mask IPs when logging: 192.168.1.xxx

2. Caching Strategy​

// Cache IP information (changes infrequently)
const CACHE_TTL = 24 * 60 * 60 * 1000; // 24 hours

async function lookupWithCache(ip) {
  const cached = cache.get(ip);
  if (cached && Date.now() - cached.time < CACHE_TTL) {
    return cached.data;
  }
  
  const data = await lookupIP(ip);
  cache.set(ip, { data, time: Date.now() });
  return data;
}

3. Accuracy Limitations​

  • Country: ~99% accurate
  • City: 55-80% accurate
  • Coordinates: May have km-level errors
  • VPN/Proxy shows server location, not user location

Additional Resources​