SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
172-104-98-142.ip.linodeusercontent.com
SSL/TLS Certificate
SSL/TLS Certificate for 172-104-98-142.ip.linodeusercontent.com
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- asika.tw
- Valid from
- Oct 2, 2026
- Valid until
- Dec 31, 2026 (53 days remaining)
- Public key
- EC 256-bit
- Serial
- 064EDE0A655F7700BFEF3A030B8FD21D7D01
- SHA-256 fingerprint
- 02:FD:F4:D7:0B:79:6C:DB:37:85:5B:91:C4:64:C9:F6:E7:10:C9:61:47:7B:EB:43:C4:2E:BE:35:7E:AB:8C:58
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by 172-104-98-142.ip.linodeusercontent.com's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch 172-104-98-142.ip.linodeusercontent.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.