IP Address & Networking Learning Center
Structured, source-backed technical guides written for students, developers, IT support teams, and internet users in India. Every guide cites primary IETF RFCs, IANA registries, or dated APNIC measurements.
01. IP Addressing Fundamentals
How packets travel across routers, public vs. private RFC 1918 blocks, and checking addresses on your devices.
What Is an IP Address?
Understand how packets travel from your device and home router through your ISP to internet destinations.
Public IP vs Private IP
Compare globally routable public addresses with RFC 1918 LAN ranges and RFC 6598 CGNAT space.
How to Find Your Public & Local IP
OS-by-OS instructions for Android, iOS, Windows 11, macOS, and Linux terminal commands.
02. India Telecom Architecture: CGNAT & IPv6
Carrier-Grade NAT (RFC 6598 100.64.0.0/10), shared mobile gateways, and APNIC IPv6 deployment measurements in India.
IPv6 Adoption in India
Understand APNIC Labs measurement methodology, Indian dual-stack mobile architecture, and how to test IPv6.
What Is CGNAT?
Understand RFC 6598 100.64.0.0/10 shared address space, double NAT, port forwarding limits, and IPv6 alternatives.
03. IP Geolocation Methodology & Privacy Limits
How geolocation databases map prefixes, why city estimates shift, and realistic threat-model analysis.
How IP Geolocation Works
Explore the data pipeline from RIR allocations, geofeed files, and routing hints to geolocation databases.
IP Geolocation Accuracy
Understand why country lookup is reliable while city estimates shift across mobile gateways and CGNAT pools.
Can Someone Find You by IP?
Separate realistic network exposure from myths: what websites, games, and ISPs actually see from an IP.
04. IPv4 vs. IPv6 Protocol Comparison
Bit width, header structure, hexadecimal zero-compression, and dual-stack coexistence.
05. Autonomous Systems & Internet Routing
How ASNs, BGP announcements, and RIR RDAP allocations interconnect the global internet.
06. DNS & Reverse Pointer Resolution
How in-addr.arpa and ip6.arpa reverse zones map IP addresses back to PTR hostnames.
Technical Specifications & Protocol Facts
Authoritative parameters, dimensions, and IETF RFC compliance
| Parameter / Dimension | Technical Specification | Standard / Authority |
|---|---|---|
| Canonical Document Scope | Learning Center — Route /learn | IPAddressLookup.in Technical Reference |
| Supported Address Families | IPv4 (32-bit dotted-decimal) & IPv6 (128-bit hexadecimal) | RFC 791 / RFC 8200 / RFC 5952 |
| Authoritative Registration Protocol | Registration Data Access Protocol (RDAP) via IANA Bootstrap | RFC 7480–7484 / RFC 9224 |
| Special-Purpose Range Classification | Private LAN (RFC 1918), Shared CGNAT 100.64.0.0/10 (RFC 6598), ULA (RFC 4193) | RFC 6890 IANA Registry |
Frequently Asked Questions
Concise answers verified against IANA, APNIC, and IETF protocol standards
What is the primary purpose of Learning Center?
Structured technical guides covering IP addressing, CGNAT, IPv6 in India, geolocation accuracy, and DNS. Every output on IPAddressLookup.in follows IETF RFC standards and cites primary RIR/IANA sources.
Are IP and network queries on this page logged or shared with advertisers?
No. IPAddressLookup.in operates on a strict data-minimization model with stateless query execution, short-lived caching (15 minutes max for upstream RDAP/DNS), and zero persistent user lookup history.
How often is the technical documentation on IPAddressLookup.in reviewed?
All protocol calculators, RFC citations, and Indian telecom notes are verified by the 2026-11-01 editorial and engineering review cycle.
Related Network Tools & Technical Guides
Contextual utilities and reference documentation verified for this workflow
Technical Reference Guides
- What Is an IP Address?
Understand how packets travel from your device and home router through your ISP to internet destinations.
- Public IP vs Private IP
Compare globally routable public addresses with RFC 1918 LAN ranges and RFC 6598 CGNAT space.
- IPv4 vs IPv6
Technical comparison of 32-bit dotted-decimal IPv4 and 128-bit hexadecimal IPv6 packet addressing.
- How IP Geolocation Works
Explore the data pipeline from RIR allocations, geofeed files, and routing hints to geolocation databases.
- IP Geolocation Accuracy
Understand why country lookup is reliable while city estimates shift across mobile gateways and CGNAT pools.
- What Is an ASN?
Learn how Autonomous System Numbers identify networks in BGP routing and RIR RDAP registries.
- What Is Reverse DNS?
Walk through PTR records, IPv4 octet reversal, IPv6 32-nibble ip6.arpa delegation, and FCrDNS checks.
- Can Someone Find You by IP?
Separate realistic network exposure from myths: what websites, games, and ISPs actually see from an IP.
- How to Find Your Public & Local IP
OS-by-OS instructions for Android, iOS, Windows 11, macOS, and Linux terminal commands.
- IPv6 Adoption in India
Understand APNIC Labs measurement methodology, Indian dual-stack mobile architecture, and how to test IPv6.
- What Is CGNAT?
Understand RFC 6598 100.64.0.0/10 shared address space, double NAT, port forwarding limits, and IPv6 alternatives.
Learning Center · Canonical: https://ipaddresslookup.in/learn · Reviewed: 2026-11-01
Reviewer: IPAddressLookup.in Technical Network Utility Group · Stateless Privacy · Accuracy & Data Limits