IP Lookup
Inspect public IP ownership, ASN context, and coarse network metadata.
Open tool →Premium Network Tool Hub
Use the tools hub to move straight into live IP, DNS, SSL, HTTP header, RDAP, ASN, and email-authentication checks.
Use this tools hub to jump quickly into IP lookups, DNS lookups, SSL checks, email authentication analysis, HTTP header review, subnet math, and other public internet infrastructure workflows.
IP Lookup
DNS Records
ASN Research
SSL Checks
Email Security
HTTP Headers
Start with the essentials
IP LookupInspect public IP ownership and network context.
DNS LookupReview DNS records, nameservers, and live answers.
Domain RDAPCheck structured domain registration details.
SSL CheckerValidate HTTPS certificate coverage and status.
DKIM CheckerReview selector-based signing configuration.
DMARC CheckerInspect policy, alignment, and reporting tags.
Core network and ownership tools
Use the tools hub when you already know what you want to test and need fast answers from public infrastructure data. It is best for direct checks such as DNS records, SSL validation, HTTP headers, RDAP responses, IP ownership, and email-authentication configuration.
ASN Lookup
Expand from one IP into the broader network operator and routing footprint.
Open tool →Reverse DNS
Add PTR and hostname clues to address research and incident review.
Open tool →Domain RDAP
Check structured public registration details for domains.
Open tool →Website IP Finder
Map a website or hostname to public IP infrastructure.
Open tool →WHOIS Lookup
Review classic WHOIS-style registration and ownership data when available.
Open tool →DNS and email security tools
Use these tools when troubleshooting email delivery, DNS policy, domain verification, and authentication issues.
DNS Lookup
Inspect live DNS answers, nameservers, and record visibility.
Open tool →MX Lookup
Confirm where inbound mail should be routed.
Open tool →SPF Checker
Validate sender authorization policy records.
Open tool →DKIM Checker
Review selector formatting and signing configuration.
Open tool →DMARC Checker
Inspect policy mode, reporting tags, and enforcement posture.
Open tool →DNSSEC Checker
Validate signed-zone and DNS trust signals.
Open tool →Web, certificate, and response validation tools
Use these tools when reviewing live website behavior, trust signals, transport security, and response headers.
SSL Checker
Validate HTTPS certificates, hostname coverage, and trust status.
Open tool →HTTP Headers
Inspect live server response headers for policy and security review.
Open tool →security.txt Viewer
Check published vulnerability disclosure details and reporting endpoints.
Open tool →robots.txt Viewer
Review crawl instructions, blocked paths, and search indexing signals.
Open tool →Check Domain Security Headers
Jump into header-focused review for web hardening and troubleshooting.
Open tool →Find Mail Server
Follow mail-routing clues from the domain side when delivery looks wrong.
Open tool →Reference and utility tools
Helpful supporting utilities for subnetting, ports, record types, and related troubleshooting.
Subnet Calculator
Calculate CIDR ranges, mask sizes, and host counts.
Open tool →Port Lookup
Check common service ports during firewall or exposure review.
Open tool →TXT Record Checker
Review TXT records used for verification and policy data.
Open tool →NS Lookup
Confirm authoritative nameserver delegation and DNS hosting targets.
Open tool →Domain to IP
Resolve domains toward their public internet-facing address targets.
Open tool →CAA Lookup
Review certificate authority authorization policy records.
Open tool →How to turn raw tool output into better decisions
Use these editorial and navigation pages to move from raw lookup output into guided research paths.
Comparison Guides
Read plain-English comparisons for IP, DNS, RDAP, WHOIS, SSL, and email concepts.
Read comparison guides →Browse All Tools, Guides, and Hubs
Use the full HTML sitemap and resource hub for broader exploration.
Browse the full resource map →Learn Hubs and Explainers
Review foundational explainers before or after you run deeper checks.
Read explainers →Related support resources
These are useful when you want simpler learning material or need to branch into non-lookup troubleshooting.
Understanding DNS
A cleaner plain-English companion guide for users who want simpler DNS context before using advanced tools.
Read resource →Best Practices for MX Records
Helpful support reading when troubleshooting inbound mail flow and mail routing records.
Read resource →CheckMyError
Good fallback support when the problem turns out to be a browser or application error instead of DNS or IP data.
Explore resource →Use the tool hub with the right next step
These supporting hubs help users decide whether they should run a live lookup, read an explainer, compare concepts, or browse grouped targets first.
Learn
Understand IP, DNS, RDAP, SSL, and email-authentication concepts before running deeper checks.
Read the learn hub →Comparisons
Separate similar DNS, IP, WHOIS, RDAP, SSL, and email-security topics before using a tool.
Read comparisons →Collections
Browse curated targets like public DNS IPs, major domains, and cloud-provider ASNs.
Browse collections →Trending
See which tools, lookup pages, and investigation examples are drawing the most interest.
Review trending pages →Use the right next step after a live check
Move from live checks into the most useful follow-up path, whether that means learning fundamentals, reading comparisons, or browsing grouped targets.
Tools
Run live checks for IPs, domains, DNS, SSL, headers, and email security.
See tool options →Comparisons
Use plain-English comparison guides for similar infrastructure topics.
Read comparison guides →Learn
Strengthen your understanding of DNS, IP ownership, RDAP, SSL, and email-authentication concepts before moving into deeper troubleshooting.
Read learn resources →Collections
Browse grouped targets and themed lookup sets.
Browse collection pages →Browse All
Use the full HTML sitemap to navigate every major area of the site.
Browse the full resource map →