SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ec2-52-52-211-101.us-west-1.compute.amazonaws.com
SSL/TLS Certificate
SSL/TLS Certificate for ec2-52-52-211-101.us-west-1.compute.amazonaws.com
Self-signed- Issued by (CA)
- SomeOrganization
- Subject
- ip-172-31-8-3
- Valid from
- Nov 15, 2015
- Valid until
- Nov 14, 2016 (expired 3645 days ago)
- Public key
- RSA 2048-bit
- Serial
- 0ACB
- SHA-256 fingerprint
- E8:07:16:88:40:73:5B:C6:69:D5:53:62:D6:EA:1F:12:6B:AE:3C:2E:52:E8:8D:A8:AA:E6:BE:0A:3C:E0:97:6A
- Chain
- ip-172-31-8-3
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by ec2-52-52-211-101.us-west-1.compute.amazonaws.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch ec2-52-52-211-101.us-west-1.compute.amazonaws.com continuously, notifying you the moment anything moves across all three signals:

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