IP Geolocation Concepts & Reference

Essential background knowledge, detection mechanics, and technical explanations for all core parameters returned by the IP2Location.io REST API.

Core Concept

1. What is IP Geolocation?

Solution: Localization →

IP Geolocation is the technique used to determine the approximate geographical location of an Internet-connected device using its IP address (IPv4 or IPv6), without needing device GPS permissions or browser prompting. 

// Primary Location Fields Returned 
{
  "ip": "8.8.8.8",
  "country_code": "US",
  "country_name": "United States",
  "region_name": "California",
  "city_name": "Mountain View"
}

When should I use this?

Use IP geolocation to personalize regional experiences, analyze traffic by location, improve security, and deliver location-relevant content.

Primary Use Cases

Location targeting, regional content delivery, geographic analytics, and fraud or security assessment.

API Result Fields

ip, country_code, country_name, region_name, city_name

Architecture

2. How IP Geolocation Works

When a query is received, our multi-region Anycast API endpoint resolves the user's IP address against proprietary databases. 

Client Request → Anycast Edge Node → Server Processing (~1ms) → JSON/XML Response

When should I use this?

Reference this architecture when evaluating API latency, global availability, or integration requirements for applications that perform IP geolocation in real-time.

Primary Use Cases

Real-time IP geolocation, user personalization, security screening, traffic analysis, and location-based application logic.

API Result Fields

ip, country_code, country_name, region_name, city_name

Accuracy & Bounds

3. IP Address Accuracy

Latitude and Longitude coordinates in IP geolocation point to a city centroid (the approximate center of the city), not a physical street address or home, ensuring user privacy compliance while delivering high regional precision.

Country Accuracy (~99%)

Highest precision level; almost all assigned IP ranges resolve correctly to their assigned nation.

City Accuracy (~80-90%)

Depends on local ISP routing practices and whether the user is on mobile carrier NAT (CGNAT).

When should I use this?

Use accuracy metrics when setting geographic thresholds for regional pricing, localized tax calculation, or distance radiuses.

Primary Use Cases

Regional service availability, local retail store locators, regional ad distribution.

API Result Fields

latitude, longitude, area_code, zip_code

Protocols

4. IPv4 vs IPv6 Support

IP2Location.io supports both IPv4 and IPv6 address lookups through the same API endpoint and response structure, simplifying integration without requiring separate implementations for each IP version. 

// IPv4 Query
GET https://api.ip2location.io/?ip=8.8.8.8

// IPv6 Query
GET https://api.ip2location.io/?ip=2001:4860:4860::8888

When should I use this?

Use IPv4 and IPv6 lookup support when your application needs consistent IP geolocation and intelligence across users connecting with either IP version.

Primary Use Cases

IPv4/IPv6 traffic analysis, access logging, geolocation, security monitoring, and applications supporting IPv6-enabled networks.

API Result Fields

ip

Networking

5. ASN Explained (Autonomous System)

Solution: Marketing →

An Autonomous System (AS) is a group of IP networks operated under a common routing policy, such as those belonging to an ISP, cloud provider, university, or large organization. An Autonomous System Number (ASN) identifies that network for Internet routing. 

{
  "asn":"15169",
  "as":"Google LLC",
}

When should I use this?

Use ASN data to identify the network associated with an IP address, classify traffic sources, and apply network- or organization-based access and security policies.

Primary Use Cases

Network identification, traffic segmentation, cloud/data center detection, security analysis, and organization-level analytics.

API Result Fields

asn, as

Security

6. Proxy Detection

Solution: Security →

Identifies whether an IP address is associated with a proxy, VPN, Tor exit node, data center, or other privacy and intermediary network services. 

{
  "is_proxy": true,
  "proxy": {
    "proxy_type": "DCH"
  }
}

When should I use this?

Use proxy detection to identify potentially anonymized or high-risk traffic and strengthen fraud prevention, access control, bot mitigation, and abuse detection.

Primary Use Cases

Fraud prevention, bot and scraping detection, suspicious traffic filtering, and access-control decisions.

API Result Fields

is_proxy, proxy.proxy_type

Security

7. VPN Detection

Solution: Security →

Identifies IP addresses associated with anonymizing VPN services and, when available, returns the VPN provider. 

{
  "is_proxy": true,
  "proxy": {
    "proxy_type": "VPN",
    "provider": "NordVPN",
    "is_vpn": true
  }
}

When should I use this?

Use VPN detection when enforcing content licensing or geo-restrictions, assessing location-based fraud risk, or identifying users masking their network location.

Primary Use Cases

Content geo-restriction, streaming and licensing enforcement, fraud risk assessment, and promotion abuse prevention.

API Result Fields

is_proxy, proxy.is_vpn,proxy.proxy_type, proxy.provider

Localization

8. Timezone Lookup

Solution: Localization →

Returns the IANA/Olson time zone identifier, current UTC offset, and Daylight Saving Time (DST) status associated with an IP address location. 

{
  "time_zone": "-07:00",
  "time_zone_info": {
    "olson": "America/Los_Angeles",
    "gmt_offset": -25200,
    "is_dst": true
  }
}

When should I use this?

Use time zone data to display local schedules, time notifications for appropriate local hours, and present dates and times in the user's local time zone.

Primary Use Cases

Notification scheduling, localized date and time display, business hours localization, and time zone-aware applications.

API Result Fields

time_zone, time_zone_info.olson, time_zone_info.gmt_offset, time_zone_info.is_dst

Localization

9. Currency & Language Lookup

Solution: Localization →

Returns the local currency and language associated with the IP address location, including currency code, name and symbol, as well as language code and name. 

"country":{
		"currency":{
			"code":"USD",
			"name":"United States Dollar",
			"symbol":"$"
		},
		"language":{
			"code":"EN",
			"name":"English"
		}
	}

When should I use this?

Use currency and language data to automatically localize pricing, suggest the appropriate interface language, and deliver more relevant regional experiences.

Primary Use Cases

Localizing product prices, setting default checkout currency, suggesting interface language, and serving localized content.

API Result Fields

country.currency.code, country.currency.name, country.currency.symbol, country.language.code, country.language.name

Classification

10. Usage Type Classification

Classifies the type of network or organization associated with an IP address, helping applications segment and analyze traffic by network usage.

COM: Commercial
ORG: Organization
GOV: Government
MIL: Military
EDU: University/College/School
LIB: Library
CDN: Content Delivery Network
ISP: Fixed Line ISP
MOB: Mobile ISP
DCH: Data Center/Web Hosting/Transit
SES: Search Engine Spider
AIC: AI Crawler
RSV: Reserved

When should I use this?

Use usage type data to distinguish traffic from ISPs, mobile networks, organizations, data centers, crawlers, and other network categories for segmentation and policy decisions.

Primary Use Cases

Traffic segmentation, network classification, data center filtering, crawler identification, and network-aware analytics.

API Result Fields

usage_type