IP Address

What is an IP Address?

An IP Address (Internet Protocol Address) is a unique numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. Think of it as your device’s digital address on the internet, similar to a street address for physical mail.

IP Address Formats

IPv4 (Internet Protocol version 4)

The most common format, consisting of four numbers separated by dots:

192.168.1.1
8.8.8.8
203.0.113.45

Each number ranges from 0 to 255, providing approximately 4.3 billion unique addresses.

IPv6 (Internet Protocol version 6)

The newer format designed to address IPv4 exhaustion:

2001:0db8:85a3:0000:0000:8a2e:0370:7334
2001:db8::8a2e:370:7334 (shortened)

IPv6 provides 340 undecillion unique addresses (340 with 36 zeros after it).

Types of IP Addresses

Public IP Addresses

Assigned by your Internet Service Provider (ISP)
Visible to websites and services you connect to
Unique across the entire internet
Used for external communication

Private IP Addresses

Used within local networks (home, office)
Not routable on the public internet
Common ranges: 192.168.x.x, 10.x.x.x, 172.16.x.x
Reused across different private networks

Static vs Dynamic

Static IP: Permanent address that never changes
Dynamic IP: Temporary address assigned by DHCP, changes periodically

Why IP Addresses Matter for Proxies

When using a proxy service like CorsProxy, understanding IP addresses is crucial:

IP-Based Rate Limiting

Many APIs implement rate limits based on IP addresses. Using a proxy:

Distributes requests across multiple IP addresses
Prevents your origin IP from being rate-limited
Enables higher request throughput

Geo-Restriction Bypass

Content and APIs often restrict access by IP geolocation:

CorsProxy’s global network provides IPs from 330+ locations
Access region-specific content and APIs
Test localized features during development

IP Privacy Protection

Your real IP address reveals information about you:

Geographic location (city/country level)
ISP and organization
Potential tracking across websites

A proxy masks your real IP, replacing it with the proxy server’s IP address.

IP Address in Web Development

CORS and IP Addresses

Cross-Origin Resource Sharing (CORS) policies don’t directly depend on IP addresses but on origins (protocol + domain + port). However:

Some APIs whitelist specific IP addresses
Rate limiting often tracks IP addresses
Security policies may block suspicious IP ranges

Request Headers

When making HTTP requests, your IP address is typically included in headers:

// Your IP might appear in headers like:
X-Forwarded-For: 203.0.113.45
X-Real-IP: 203.0.113.45

CorsProxy handles these headers appropriately, ensuring proper request forwarding.

IP Address Security

Threats

DDoS Attacks: Targeting specific IP addresses with traffic floods
IP Spoofing: Faking source IP addresses in packets
Geolocation Tracking: Tracking user locations via IP
Blacklisting: Blocking malicious or suspicious IPs

Protection with Proxies

CorsProxy provides IP-level protection by:

Hiding your origin server’s IP address
Distributing requests across a global IP pool
Implementing DDoS mitigation at the edge
Filtering malicious traffic before it reaches your infrastructure

IPv4 Address Exhaustion

The internet is running out of IPv4 addresses:

4.3 billion addresses seemed sufficient in 1981
Modern devices (phones, IoT, servers) exceeded this capacity
NAT (Network Address Translation) extends IPv4 by sharing public IPs
IPv6 adoption is the long-term solution

Practical Examples

Finding Your IP Address

# Command line
curl https://api.ipify.org

# Or visit
https://corsproxy.io/api/ip

Using CorsProxy with IP Logging

const response = await fetch('https://corsproxy.io/?url=https://httpbin.org/ip');
const data = await response.json();
console.log('Proxy IP:', data.origin); // CorsProxy's IP, not yours

IP-Based Access Control

// Some APIs whitelist IPs
const allowedIPs = ['203.0.113.45', '198.51.100.0/24'];

// CorsProxy provides stable IPs for whitelisting
// Contact support for dedicated IP addresses

IP Addresses and Privacy Laws

Different jurisdictions treat IP addresses differently:

GDPR (EU): Considers IP addresses as personal data
CCPA (California): May classify IPs as personal information
Logging Requirements: Some countries mandate IP logging

When using proxy services, understand:

How the provider logs IP addresses
Data retention policies
Compliance with privacy regulations

CorsProxy prioritizes privacy while maintaining security. See our privacy policy for details.