What does this Domain & IP WHOIS Lookup tool show?

It shows domain registration and IP network data: registrar details, nameservers, domain status codes, creation/expiration dates, IP network range (NetRange, CIDR), organization, ASN, server geolocation, abuse contacts, and authoritative RDAP/WHOIS records.

What is the difference between Domain WHOIS and IP WHOIS?

Domain WHOIS inspects human-readable domain name registrations, registrars, and nameservers. IP WHOIS examines the numerical network block, identifying the owning organization, CIDR subnet, ASN, ISP, and geographic origin of the server.

What are NetRange and CIDR notation?

NetRange displays the start and end IP boundaries (e.g., 104.16.0.0 – 104.31.255.255), while CIDR represents that same subnet concisely with a prefix length (e.g., 104.16.0.0/12). It indicates the overall size of the allocated network block.

What is an Autonomous System Number (ASN)?

An ASN is a unique global identifier assigned to a network routing domain. It enables Internet Service Providers and hosting providers to exchange BGP routing pathways across the internet.

Why is Reverse DNS (PTR) sometimes unconfigured?

A Reverse DNS (PTR) record must be explicitly configured by the IP owner or hosting provider. If the server does not send outgoing mail or require reverse verification, the PTR record is often left unassigned.

How does IP WHOIS assist with cyber incident response and abuse reporting?

IP WHOIS output includes dedicated abuse contact email addresses. If you detect malicious activity or spam originating from an IP, you can report the incident directly to the responsible network provider.

Why are some registrant contact details hidden in WHOIS/RDAP results?

Due to privacy regulations such as GDPR and registrar privacy masking services, personal contact details (names, email addresses, phone numbers) are frequently redacted to prevent spam and identity theft.

Domain & IP WHOIS Lookup

Domain & IP WHOIS Lookup is an all-in-one network intelligence tool that lets you inspect the official registration, ownership, and routing infrastructure for any domain name (e.g., example.com) or IP address (IPv4 / IPv6, e.g., 104.21.44.170). The tool automatically detects your input type and generates a comprehensive technical dossier: from registrar lifecycle and DNS nameservers to IP subnet blocks, ASN routing paths, and geolocation.

What Our Tool Analyzes for IP Addresses

When you query an IP address, our tool conducts a multi-layered network and registry analysis:

NetRange & CIDR Allocation: Discovers the exact IP boundary range and subnet prefix notation (e.g., 104.16.0.0/12) assigned to the network.
Network Name (NetName) & Organization: Reveals the registered network name and the company or hosting entity responsible for the block (e.g., Cloudflare, Akamai, Google, or a regional ISP).
Autonomous System Number (ASN): Identifies the global BGP routing autonomous system that announces this IP to the global internet.
Geolocation & Infrastructure: Provides the country, city, region, and approximate geographic location of the host server.
Reverse DNS (PTR Hostname): Queries whether the IP address resolves to an authoritative pointer record hostname.
Abuse & Security Contacts: Surfaces designated email addresses and contact points for reporting security incidents, phishing, spam, or copyright violations.
Registration & Updated Timestamps: Displays when the IP allocation was originally established and its latest modification date.
Raw RDAP / WHOIS Dossier: Gives you instant, one-click access to copy and inspect the complete raw response from the authoritative registry.

Domain WHOIS vs. IP WHOIS: Key Differences

Although both services share the historical WHOIS naming, they operate at fundamentally distinct layers of the internet:

Domain WHOIS / RDAP: Evaluates human-readable names (such as example.com). It reveals which accredited registrar sold the domain, which nameservers (NS) govern DNS resolution, when the registration expires, and which lifecycle status codes apply. Our tool also resolves the active server IP and MX mail server infrastructure.

IP WHOIS / RDAP: Inspects numerical network blocks allocated by Regional Internet Registries (RIRs). Unlike domains, IP addresses are allocated in large blocks to internet service providers, hyperscale cloud networks, and enterprises. IP WHOIS uncovers who owns the underlying subnet, who is legally responsible for network traffic, and where the traffic routes.

Practical Benefits for Cybersecurity & System Administrators

Comprehensive IP WHOIS lookups are crucial for daily security operations and network management:

Incident Response & Threat Hunting: When investigating suspicious log entries, port scans, or DDoS traffic, an IP lookup immediately reveals the hosting provider, ASN, and country of origin.
Spam & Phishing Verification: Examining email header IP addresses helps you verify if a message originated from legitimate corporate mail servers or a compromised third-party host.
Hosting & CDN Identification: Determine whether a website is directly hosted on a private dedicated server or shielded behind a CDN proxy (like Cloudflare or Fastly).
Firewall Rule Tuning: NetRange and CIDR block metrics allow network engineers to build accurate IP whitelist and blacklist policies.

The Transition to Modern RDAP

Traditional WHOIS (operating over port 43) served the internet for decades but suffered from unstructured text output, inconsistent regional formats, and limited security controls. The modern standard—RDAP (Registration Data Access Protocol)—delivers structured, standardized JSON records over secure HTTP. Our tool integrates modern RDAP protocols with established WHOIS mechanisms to provide lightning-fast, highly accurate results.