IPv4

1. What is IPv4 in Browser Fingerprinting

The IPv4 address is one of the most fundamental components of online identity tracking. Websites and services analyze IP addresses to:

Track user location (via geolocation databases)
Monitor session behavior (e.g., login attempts, request patterns)
Enforce geo-restrictions (banning or allowing access based on country/ISP)
Associate accounts (flagging multiple accounts from the same IP as suspicious)

Unlike higher-level fingerprints (e.g., canvas, fonts), IPv4 is a network-level fingerprint, meaning any inconsistency between the IP and other browser attributes (timezone, language, etc.) can trigger security systems.

2. How Platforms Detect & Block IPv4 Anomalies

Detection systems classify IPv4 addresses based on:

IP Type & Origin

Residential (home ISP-assigned) → High trust
Datacenter (cloud/VPN servers) → Often blocked
Mobile (cellular networks) → Medium trust
Hosting/Proxy → Frequently flagged

Behavioral Signals

Velocity changes (rapid IP switching)
Blacklisted ranges (VPN/proxy databases)
Geolocation mismatch (IP vs. browser language, timezone)
Session inconsistency (IP changes mid-session without reauthentication)

Automation Red Flags

Abnormal request headers (e.g., missing Accept-Language for the IP’s country)
Timing patterns (unnatural delays between IP rotations)

Strict platforms (e.g., social media, financial services) may shadow-ban or rate-limit accounts using suspicious IPs.

3. How FlashID Manages IPv4 Fingerprints

FlashID supports both dynamic and static IPv4 proxies, allowing users to select IPs that match their target fingerprint profile seamlessly.

✅ Dynamic IPv4 (Rotation Support)

Residential IP pools: Rotates among real ISP-assigned addresses.
Auto-session sync: Changes IPs at custom intervals (minutes/hours) without breaking active sessions.
Location-aware switching: Ensures new IPs align with the browser’s geolocation spoofing.
Natural delay simulation: Mimics human-like IP cycling patterns to avoid bot detection.

✅ Static IPv4 (Persistent Identity)

Dedicated residential IPs: Long-term IPs tied to a specific city/ISP.
Sticky session support: Maintains the same IP across multiple logins.
Whitelist compatibility: IPs can be registered on platforms requiring fixed IP verification.
Failover handling: Backup IPs activate if the primary is blocked.

🔥 IP Spoofing + Anti-Fingerprint Synergy

FlashID integrates IP masking with broader fingerprint control:

HTTP header cleanup: Removes proxy/VPN traces (e.g., X-Forwarded-For).
TCP/IP stack tweaks: Modifies TTL, TCP window size to mimic target IP types.
DNS leak prevention: Ensures DNS queries match the spoofed IP’s expected resolver.
WebRTC/IPv6 blocking: Prevents accidental leaks outside the proxy tunnel.

This multi-layered approach makes each browser profile appear as a unique, organic user, even when managing hundreds of accounts.