Domain IP Converter — Free Bulk DNS Lookup & Reverse PTR Tool
The Domain Name System (DNS) is the foundational addressing protocol of the global internet, mapping human-readable hostnames (e.g. freeztools.com) to machine-routable IP addresses. Whether you are auditing network endpoints, configuring firewall whitelist rules, verifying DNS propagation across Anycast edge nodes, or troubleshooting mail server PTR records, this domain IP converter provides fast forward and reverse DNS lookup capabilities with support for bulk processing up to 20 simultaneous queries.
How to Convert Domains & IP Addresses
Select Conversion Mode
Choose Domain ➔ IP to resolve domain hostnames to A & AAAA records, or IP ➔ Domain for reverse PTR lookups.
Enter Entries or Load Starter Presets
Type or paste up to 20 domains or IP addresses (one per line), use the Clean & Format button to strip unwanted protocols, or click 1-click starter presets.
Execute Real-Time DNS-over-HTTPS
Click Convert or press Ctrl+Enter. The tool queries authoritative DNS servers in real time for IPv4 (A), IPv6 (AAAA), CNAME, and PTR records.
Filter, Copy & Export Reports
Filter by status or IP version, click individual IP badges with 1-click clipboard copy, or export complete datasets as CSV spreadsheets, JSON payloads, or TXT audit logs.
DNS Record Types Reference Specification
| Record Type | Full Name | Data Format | Lookup Mode | Primary Purpose |
|---|---|---|---|---|
| A | Address Record | IPv4 (e.g. 142.250.185.46) | Domain ➔ IP | Maps a hostname to 32-bit IPv4 address |
| AAAA | IPv6 Address Record | IPv6 (e.g. 2607:f8b0:4006::200e) | Domain ➔ IP | Maps a hostname to 128-bit IPv6 address |
| PTR | Pointer Record | Canonical Domain Hostname | IP ➔ Domain | Reverse DNS lookup for IP hostname verification |
| CNAME | Canonical Name Record | Alias Domain Name | Forward Alias | Aliases one domain hostname to another domain |
| MX | Mail Exchanger Record | Mail Server Host + Priority | Mail Routing | Directs emails to domain mail servers |
| TXT | Text Record | Arbitrary Text String | Verification | SPF, DKIM, DMARC & domain ownership verification |
Reverse DNS (rDNS) & Email Deliverability Best Practices
Properly configured forward and reverse DNS records are critical for email deliverability, cybersecurity, and network routing:
- ✓Forward-Confirmed Reverse DNS (FCrDNS): Ensure your mail server IP resolves via PTR to a hostname that in turn resolves back via A record to the exact same IP.
- ✓Avoid Generic ISP Hostnames: Set custom FQDNs (e.g.,
mail.example.com) rather than default ISP hostnames (e.g.142-250-185-46.dynamic.isp.net). - ✓Set Appropriate TTL Values: Use shorter TTLs (300s to 3600s) during server migrations and longer TTLs (86400s) for stable production endpoints.
Frequently Asked Questions
What does Domain to IP conversion do?
Domain to IP conversion resolves a human-readable domain name (like telekit.link or google.com) into its underlying numerical IP address (IPv4 A record or IPv6 AAAA record) through the Domain Name System (DNS) protocol.
Can I convert IP addresses back into domain names?
Yes. The tool performs Reverse DNS (PTR) lookups using in-addr.arpa (for IPv4) and ip6.arpa (for IPv6) zones to identify the canonical domain hostname mapped to a given IP address.
How does the client-side DNS-over-HTTPS (DoH) engine protect privacy?
Instead of routing your DNS lookups through backend telemetry servers, queries are dispatched directly from your browser to public RFC 8484 DNS-over-HTTPS resolvers (Cloudflare and Google DNS) via HTTPS JSON endpoints. No queries or IPs are logged on our servers.
Why does a single domain name return multiple IP addresses?
High-traffic platforms and Content Delivery Networks (CDNs like Cloudflare, Fastly, and Akamai) utilize Anycast routing and DNS round-robin load balancing, distributing incoming traffic across multiple geo-distributed IPv4 and IPv6 edge servers.
What are DNS A and AAAA records?
An 'A' record (Address record) maps a domain name to a 32-bit IPv4 address (e.g. 142.250.185.46). An 'AAAA' record (Quad-A record) maps a domain name to a 128-bit IPv6 address (e.g. 2607:f8b0:4006::200e).
Why do some reverse DNS (PTR) lookups return no domain?
Reverse DNS lookups require a configured PTR record in the IP owner's delegated in-addr.arpa or ip6.arpa zone. If an ISP, cloud host, or network administrator has not configured a reverse pointer record, the PTR query returns NXDOMAIN or no answer.
What is Forward-Confirmed Reverse DNS (FCrDNS) and why is it important?
FCrDNS is a verification technique where an IP address is reverse-resolved via PTR to a hostname, and that hostname is immediately forward-resolved via A/AAAA back to an IP. If both match, identity is verified. Major mail transfer agents (MTAs) require valid FCrDNS to prevent spam.
Can I export conversion results to CSV, JSON, TXT, or Markdown?
Yes. Telekit Tools features a complete export suite allowing you to download RFC 4180 CSV spreadsheets, structured JSON payloads, formatted TXT audit logs, or copy clean Markdown tables with customizable filenames and ISO date stamps.
What developer integration snippets and script downloads are supported?
Click the Developer API button (or press Alt+S) to view and download standalone script files across 7 programming languages and environments: TypeScript (dns_lookup.ts via DoH fetch), Python (dns_lookup.py via dnspython), Go (dns_lookup.go via net.LookupIP), Rust (dns_lookup.rs), Java (DnsLookup.java), Bash (dns_lookup.sh via dig/host), and cURL (doh_query.sh via RFC 8484).
What keyboard shortcuts and clipboard features are supported for rapid workflow?
Press Alt+P for DevToys-style Smart Clipboard Auto-Detect (auto-identifying domains vs IP addresses and switching modes automatically), / to focus the input editor, Ctrl+Enter to trigger DNS conversion, Alt+V to toggle between 2-Column Split Studio and Full-Width Stacked layout views, Alt+D to star the tool, Alt+S for Developer API snippets, Alt+K (or ?) for Keyboard Shortcuts, Alt+R to load randomized presets, Alt+C to download CSV, Alt+M to copy Markdown table, and Esc to reset.
⌨️Desktop Keyboard Shortcuts Reference
Work faster with streamlined keyboard accelerators designed for network engineers and DevOps developers.
| Shortcut Key | Action | Description |
|---|---|---|
| / | Focus Query Editor | Instantly focus the domains/IPs input textarea |
| Ctrl + Enter | Run DNS Lookup | Execute real-time DNS-over-HTTPS queries |
| Alt + P | Smart Clipboard Detect | Auto-detect domains vs IPs from clipboard |
| Alt + D | Star / Favorite Tool | Toggle bookmark saved in telekit_starred_tools |
| Alt + V | Toggle Split / Stacked | Switch between 2-Column Split Studio and Stacked View |
| Alt + S | Developer API Code | Open 7-language DoH & DNS integration modal |
| Alt + R | Random Benchmark Preset | Load curated real-world DNS / PTR benchmark scenario |
| Alt + C | Export CSV Matrix | Download RFC 4180 CSV spreadsheet file |
| Alt + M | Copy Markdown Table | Copy GitHub Flavored Markdown table to clipboard |
| Escape | Dismiss / Reset | Close open modals, blur input, or reset workspace |
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