DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

fastmailteam.com · 103.168.172.37:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=adavis.fastmailteam.com
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-09-19T06:49:58+00:00
Expires
2026-12-18T06:49:57+00:00
Days remaining
83
Serial (hex)
05D125EDAD081E86C23D81BFBF1170AE86C4
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:adavis.fastmailteam.com, DNS:fastmailteam.com, DNS:gamemasters.fastmailteam.com, DNS:jobs.fastmailteam.com, DNS:rjbs.fastmailteam.com, DNS:sw.neilj.fastmailteam.com, DNS:values.nowylie.fastmailteam.com, DNS:woods.fastmailteam.com

SHA-256 fingerprint

7E:EA:BA:AC:1D:08:E0:C1:E8:3D:0C:EE:45:D8:35:C7:F6:45:01:B8:E3:81:CB:1D:7E:1F:08:24:5E:BE:2E:03
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
D2:F0:34:16:71:EA:7C:3C:57:B8:AE:89:B8:53:6B:9F:B1:66:B0:91
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:adavis.fastmailteam.com, DNS:fastmailteam.com, DNS:gamemasters.fastmailteam.com, DNS:jobs.fastmailteam.com, DNS:rjbs.fastmailteam.com, DNS:sw.neilj.fastmailteam.com, DNS:values.nowylie.fastmailteam.com, DNS:woods.fastmailteam.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/69.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : Sep 19 07:48:28.798 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:8B:9F:E4:59:91:2D:FE:D8:45:5D:75: BA:F7:84:C2:5F:06:AE:CE:6F:40:01:08:04:72:98:CB: 52:66:94:91:AA:02:21:00:D3:AD:A7:0E:17:FB:E5:C7: 35:BB:16:3E:00:7D:91:25:60:25:A9:04:6D:4C:60:7A: 7B:9E:CB:B0:12:CE:2E:2A Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A2:81:00:18:73:4E:17:6E:1D:47:E0:95:40:F3:81:BA: 54:66:97:CD:63:A8:43:50:71:6E:B8:09:4E:DA:F1:0D Timestamp : Sep 19 07:48:29.653 2026 GMT Extensions: 00:00:05:00:0F:A9:FB:20 Signature : ecdsa-with-SHA256 30:46:02:21:00:9C:09:34:31:3E:33:A7:3C:8B:29:84: F6:12:79:8E:3F:8E:93:BB:D6:FB:9C:FB:F3:8F:54:0A: 7C:76:5B:83:C5:02:21:00:CF:F4:21:DA:3B:3A:54:BF: 7F:C9:06:DA:22:DC:1D:B9:45:13:1B:26:07:4C:DB:54: 09:39:D5:31:71:E2:12:1F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-25T23:25:34+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
708
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2169
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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