SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

ec2-13-57-2-3.us-west-1.compute.amazonaws.com

SSL/TLS Certificate

WhoisRDAPDNS RecordsCertificateUptimeDiagnosticsHistoryHide Contact Info

SSL/TLS Certificate for ec2-13-57-2-3.us-west-1.compute.amazonaws.com

Hostname mismatch
Issued by (CA)
Let's Encrypt
Subject
gausium.com
Valid from
Oct 30, 2026
Valid until
Jan 28, 2027 (77 days remaining)
Public key
RSA 2048-bit
Serial
065EB52864B91F1B1E62071104A7D51783BE
SHA-256 fingerprint
72:9B:6A:1E:C9:71:18:9E:05:87:DD:5B:29:BE:C7:35:E2:EE:7B:D1:4D:A8:6A:9D:A3:03:E4:3E:8E:46:6F:40
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (19)
*.aio.gs-robot.com, *.dev.gs-robot.com, *.eu.gs-robot.com, *.feat.gs-robot.com, *.gausium.com, *.gausium.com.cn, *.global.gs-robot.com, *.gs-robot.com, *.gsbot.cc, *.gsbot.net, *.intra.gs-robot.com, *.na.gs-robot.com, *.na.intra.gs-robot.com, *.test.gs-robot.com, *.uat.gs-robot.com, *.us.gs-robot.com, gausium.com, gausium.com.cn, www.gausium-robot.com

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.

Never get surprised by ec2-13-57-2-3.us-west-1.compute.amazonaws.com's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch ec2-13-57-2-3.us-west-1.compute.amazonaws.com continuously, notifying you the moment anything moves across all three signals:

Certificate monitor showing the issuer, expiry date, chain status, fingerprint, covered names, and a history of a rotation and an expiry warning

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, CNAME, TXT 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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.