IP

Free Network Tools

Calculate CIDR ranges, parse DNS records, inspect public DNS and registration data, and check remote headers with guarded network access.

17 free tools · browser-local

Popular workflows

Common tasks

  • Calculate network, broadcast, range, and usable host counts.
  • Convert IPv4 addresses between decimal, hex, and binary.
  • Parse SPF, DKIM, DMARC, and zone-file snippets locally.
  • Check public DNS, RDAP registration data, and remote headers with guarded network access.

Use Fileees Network Tools when you need a focused browser workflow with clear privacy notes, practical tool order, and no signup for supported local tasks.

Which network tool should I use?

  • Start with the Network Tools tool that matches your current input, then use related tools only when the next output is clear.
  • Prefer browser-local tools for personal files, pasted snippets, and one-off workflows before considering any remote lookup.
  • Check the output visually or structurally before sharing it, especially when the source file came from a form, scan, or copied text.

Workflow order

  1. Identify the exact source format and the result you need.
  2. Run the smallest matching tool first, then inspect the output before chaining another step.
  3. Copy or download the final result only after checking privacy notes, limitations, and file quality.

Common mistakes to avoid

  • Uploading or pasting sensitive production data without checking whether the tool is browser-local or a marked remote exception.
  • Skipping output review because the task looked simple.
  • Expecting a lightweight browser tool to replace a full desktop workflow for every edge case.

Limitations before you rely on the result

  • Very large files or pasted inputs can be limited by browser memory and device speed.
  • Generated output is a practical starting point and should be reviewed before legal, security, or production use.
  • Remote network tools are clearly marked exceptions and may contact guarded Fileees functions for public lookups.

All tools in this topic

CIDR CIDR Calculator Calculate IPv4 network, broadcast, mask, range, and usable host count DevCIDRCalculator IP4 IPv4 Address Converter Convert IPv4 addresses between dotted decimal, integer, hexadecimal, and binary DevIPv4Address IP IP Range to CIDR Convert an IPv4 start and end range into CIDR blocks DevRangeCIDR MAC MAC Address Formatter Format MAC addresses with colon, hyphen, or plain notation DevMACAddress IP6 IPv6 Compressor Compress expanded IPv6 addresses with zero-run shorthand DevIPv6Compressor IP6 IPv6 Expander Expand compressed IPv6 addresses to eight padded groups DevIPv6Expander PORT Port List Parser Expand comma-separated ports and ranges into sorted port lists DevPortList CIDR CIDR Normalizer Normalize IPv4 CIDR blocks to their canonical network address DevCIDRNormalizer SPF SPF Record Parser Parse SPF mechanisms, includes, IP ranges, and policy qualifiers locally DevSPFRecord DMR DMARC Record Parser Parse DMARC policy tags, aggregate report destinations, and alignment settings locally DevDMARCRecord DKIM DKIM Record Parser Parse DKIM selector records, key types, hash algorithms, and public key hints locally DevDKIMRecord DNS DNS Zone File Parser Parse simple zone file records into structured JSON without network access DevDNSZone IDN Punycode Converter Convert internationalized domain labels to ASCII punycode locally DevPunycodeConverter DNS DNS Lookup Resolve public DNS records through a rate-limited Fileees network function DevDNSLookup RDAP RDAP WHOIS Lookup Query public RDAP registration data through a guarded network function DevRDAPWHOIS HDR Remote Header Checker Fetch public HTTP headers through a guarded network function with private IP blocking DevRemoteHeader URL Short URL Expander Follow a bounded public redirect chain through a guarded network function DevShortURL

Frequently asked questions

Do network tools make remote requests?

Local parsers do not. DNS lookup, RDAP, remote headers, and short URL expansion are clearly marked and run through guarded network functions.

Can I convert an IP range to CIDR?

Yes. IP Range to CIDR converts a start and end IPv4 range into CIDR blocks.

Can I parse SPF or DMARC records?

Yes. SPF and DMARC record parsers summarize mechanisms, policies, and report destinations locally.

Are private network targets allowed?

No. Remote lookup functions reject localhost, private, link-local, and metadata targets.

Related cheatsheets

CIDR and Subnet Cheatsheet

Quick CIDR, subnet mask, host count, and IP range reminders for network planning.

Nginx Cheatsheet

Nginx server block, proxy, redirect, and cache snippets.

Related use cases

How to use SPF Record Parser online

Use Fileees SPF Record Parser to parse spf mechanisms, includes, ip ranges, and policy qualifiers locally directly in your browser with local processing, no signup, and a clean task-focused workflow.

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