Log in
CaptainDNS

Propagation & diagnostics

Compare resolvers worldwide and inspect returned answers.

Email authentication

Tools to verify and validate your email authentication setup.

SPF syntax validator

Review include chains and DNS query limits before publishing changes.

SPF record inspector

Resolve the published TXT record, flag lookup limits and decode each mechanism.

DKIM syntax validator

Quickly check the syntax of your DKIM records.

DKIM record check

Resolve a selector and analyse the published DKIM TXT record.

DMARC syntax validator

Check rua/ruf destinations, alignment modes and the active policy before publishing.

DMARC record inspector

Resolve the published policy, surface diagnostics and confirm enforcement before switching to reject.

BIMI syntax validator

Validate BIMI tags, the logo fetch and the VMC certificate before publishing.

BIMI record inspector

Resolve the published BIMI record, inspect logo and VMC diagnostics in one place.

Email deliverability audit

Audit MX, SPF, DKIM and DMARC to confirm a domain is ready to send.

Mail header analyzer

Decode participants, authentication results and routing from raw headers.

DMARC record generator

Create compliant DMARC records with all policy and reporting options.

Text

Transform, encode and measure your content in seconds.

Text case converter

Convert any block of text to upper or lower case instantly.

Base64 encoder / decoder

Encode or decode any content in Base64 without leaving the browser.

Slug generator

Transform any sentence into an SEO-friendly slug in seconds.

Word & character counter

Measure the length of any text, with instant word and character counts.

Images

Preview and validate your BIMI logos before publishing.

BIMI logo lookup

Inspect a BIMI logo URL—format, metadata and live rendering—before rollout.

Certificates

Inspect CSRs, BIMI logos and VMC certificates before you deploy.

CSR parser

Inspect a CSR, extract subject details, fingerprints and requested SANs.

VMC inspector

Inspect a Verified Mark Certificate—issuer, validity and SAN coverage—before you publish BIMI.

IP

Look up addresses, owners, reverse records and ranges.

Reverse lookup

Resolve a PTR record and validate DNS consistency.

IP WhoIs

Identify the owner of an IP range and its contacts.

IPv4 netmask

Calculate network, broadcast and usable hosts for any IPv4 block.

My IP address

Detect your IPv4/IPv6 addresses and their geolocation.

Slug generator

Why use this generator?

Transform a title into a clean slug for your URLs.
The text is normalized to lowercase, accents removed, spaces and punctuation converted to hyphens. Duplicates are cleaned up. The result is readable by both humans and search engines.

How to use

  1. Paste or type your title.
  2. Click Generate slug.
  3. Copy the result and use it in your URL.

Tip
Keep your slugs short. 3 to 6 strong words are sufficient in most cases.

Examples

Input

Audit de délivrabilité e-mail 2025 — Guide complet

Slug

audit-delivrabilite-email-2025-guide-complet

Input

DNS Lookup : A, AAAA, CNAME & Co.

Slug

dns-lookup-a-aaaa-cname-co

Quick use cases

  • Create the route for an article or product page.
  • Generate a stable identifier for a project.
  • Harmonize URLs of a multilingual site.

SEO best practices

  • Useful keywords first.
  • Avoid stop words when possible.
  • No uppercase or special characters.
  • Only one hyphen between words.
  • No trailing period or spaces.

Important notes

  • The slug does not ensure uniqueness. Handle duplicates on the CMS side by adding a suffix if needed.
  • Emojis and symbols are removed.
  • Non-Latin languages are transliterated when possible. Check readability.
  • Avoid placing sensitive data in slugs.

Privacy commitment

Your input is sent to the CaptainDNS API solely to generate the slug. No content is stored. Only anonymous technical metrics are logged: character count and processing duration for availability monitoring.