SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for ptarq.pt
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ptarq.pt
- Valid from
- Jul 2, 2026
- Valid until
- Sep 30, 2026 (65 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 050280850FE03116F73134BD92B3CED12D15
- SHA-256 fingerprint
- 82:E7:8E:8D:AA:A6:AC:85:85:2B:99:6F:4D:5F:27:EA:9B:40:97:B1:81:70:4E:2C:C8:B1:E7:67:1B:AA:04:81
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
Never get surprised by ptarq.pt's certificate expiring
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Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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