Certificate Sans Extractor
Use Certificate Sans Extractor on AboveTool to parse URLs, headers, DNS/WHOIS text, IPs, and certificates in your browser — free, private, no signup.
Certificate Sans Extractor
lists Subject Alternative Name hostnames from PEM or openssl text
Runs in your browser. Live DNS/WHOIS registries are not queried unless a mode explicitly uses a public lookup API.
About Certificate Sans Extractor
Certificate Sans Extractor lists Subject Alternative Name hostnames from PEM or openssl text. It works by reads DNS: and IP Address: SAN entries from certificate text. Openssl x509 -noout -text is easy to paste here. Certificate Sans Extractor runs free in your browser at abovetool.com — no signup, instant results.
How to use
- Enter the inputs for this network utility (two IPs, a single address, headers, PEM, and so on).
- Click Compare IPs, Lookup, Convert, or Run depending on the tool.
- Review the on-page result (including bit diffs or maps where shown), then copy or download.
Features
- Mode-specific forms for headers, URLs, IPs, DNS, and certificates
- Client-side parsers and builders — no upload required
- Copy or download results instantly
- Unique tool copy with practical tips for each utility
Frequently asked questions
What is Certificate Sans Extractor for?
Certificate Sans Extractor is lists Subject Alternative Name hostnames from PEM or openssl text.
How does Certificate Sans Extractor calculate the result?
It calculates reads DNS: and IP Address: SAN entries from certificate text.
Any tips for using this calculator?
Openssl x509 -noout -text is easy to paste here.
Is Certificate Sans Extractor free on AboveTool?
Yes. Certificate Sans Extractor is free to use on abovetool.com with no account required, and results are calculated instantly in your browser.