Plan IPv4 ranges
Calculate CIDR details, normalize networks, and convert IP ranges into CIDR blocks.
Free Network Tools
Calculate CIDR ranges, parse DNS records, inspect public DNS and registration data, and check remote headers with guarded network access.
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Popular workflows
Convert address formats
Convert IPv4 formats and expand or compress IPv6 values for documentation.
Inspect DNS and mail records
Parse SPF, DKIM, DMARC, and zone-file snippets before publishing DNS changes.
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.
Use CIDR, DNS, headers, WHOIS, and public lookup workflows to inspect network data before publishing or debugging.
Remote network tools are marked before they contact public services, while local parsers keep pasted snippets in your browser.
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
- Identify the exact source format and the result you need.
- Run the smallest matching tool first, then inspect the output before chaining another step.
- 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 Calculator Calculate IPv4 network, broadcast, mask, range, and usable host count IPv4 Address Converter Convert IPv4 addresses between dotted decimal, integer, hexadecimal, and binary IP Range to CIDR Convert an IPv4 start and end range into CIDR blocks MAC Address Formatter Format MAC addresses with colon, hyphen, or plain notation IPv6 Compressor Compress expanded IPv6 addresses with zero-run shorthand IPv6 Expander Expand compressed IPv6 addresses to eight padded groups Port List Parser Expand comma-separated ports and ranges into sorted port lists CIDR Normalizer Normalize IPv4 CIDR blocks to their canonical network address SPF Record Parser Parse SPF mechanisms, includes, IP ranges, and policy qualifiers locally DMARC Record Parser Parse DMARC policy tags, aggregate report destinations, and alignment settings locally DKIM Record Parser Parse DKIM selector records, key types, hash algorithms, and public key hints locally DNS Zone File Parser Parse simple zone file records into structured JSON without network access Punycode Converter Convert internationalized domain labels to ASCII punycode locally DNS Lookup Resolve public DNS records through a rate-limited Fileees network function RDAP WHOIS Lookup Query public RDAP registration data through a guarded network function Remote Header Checker Fetch public HTTP headers through a guarded network function with private IP blocking Short URL Expander Follow a bounded public redirect chain through a guarded network function
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
Related use cases
How to use CIDR Normalizer online
Use Fileees CIDR Normalizer to normalize ipv4 cidr blocks to their canonical network address directly in your browser with local processing, no signup, and a clean task-focused workflow.
How to use Email Header Analyzer online
Use Fileees Email Header Analyzer to summarize email headers, received hops, sender fields, and authentication hints locally directly in your browser with local processing, no signup, and a clean task-focused workflow.
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.
How to use HTTP Header Parser online
Use Fileees HTTP Header Parser to parse http header lines into readable json directly in your browser with local processing, no signup, and a clean task-focused workflow.