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

st.com · 54.194.135.49:443

Verified

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

Subject
CN=*.atollic.com
Issuer
C=US O=Amazon CN=Amazon RSA 2048 M01
Valid from
2026-09-22T00:00:00+00:00
Expires
2027-04-07T23:59:59+00:00
Days remaining
189
Serial (hex)
0EAB30A4AF1E36A71EF73CE242886532
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.atollic.com, DNS:stm-japan.jpn.com, DNS:stmicroelectronics.com.cn, DNS:st-microelectronics.jp, DNS:stmicro.jpn.com, DNS:stm32.io, DNS:eeprom.st.com, DNS:log.st.com, DNS:stmicroelectronics.co.kr, DNS:stm.xn--fiqs8s, DNS:stm32.com.my, DNS:stmicro.com.my, DNS:memory.st.com, DNS:mcu.st.com, DNS:st7.st.com, DNS:power.st.com, DNS:st-microelectronics.com.my, DNS:st-korea.co.kr, DNS:protonworld.st.com, DNS:stm32.hk, DNS:stm32cube.jp, DNS:stm.ph, DNS:st-microelectronics.xn--fiqs8s, DNS:st-korea.com, DNS:st-japan.jp, DNS:stm32.com.tw, DNS:st-microelectronics.hk, DNS:stmicro.xn--fiqs8s, DNS:stmicroelectronics.com.my, DNS:eprom.st.com, DNS:fr.st.com, DNS:st-microelectronics.com.tw, DNS:stm32cube.cn, DNS:stmicro.com.hk, DNS:st-microelectronics.com.cn, DNS:flash.st.com, DNS:st-korea.kr, DNS:stm32.ph, DNS:nvram.st.com, DNS:stm-korea.kr, DNS:st-microelectronics.com.sg, DNS:stm-japan.jp, DNS:stmicro.hk, DNS:stm-japan.biz, DNS:stm.my, DNS:stm.sg, DNS:stmicro.kr, DNS:stm.com.cn, DNS:stm32.asia, DNS:stmicroelectronics.com.ph, DNS:eu.st.com, DNS:stm.jpn.com, DNS:stm32.my, DNS:stm8.jp, DNS:stm32.com.ph, DNS:stm32.tw, DNS:stmicro.jp, DNS:micros.st.com, DNS:stmicro.sg, DNS:st-microelectronics.my, DNS:stmicroelectronics.com, DNS:stmicro.asia, DNS:stmicroelectronics.cn, DNS:psmdev.st.com, DNS:atollic.com, DNS:it.st.com, DNS:stmicro.com.sg, DNS:stmicroelectronics.com.hk, DNS:stm32.com.hk, DNS:stm.cn, DNS:stmicro.my, DNS:st-microelectronics.tw, DNS:st.com, DNS:st-microelectronics.com.hk, DNS:stm32.kr, DNS:*.touchgfx.com, DNS:stmicro.com.tw, DNS:st-microelectronics.co.kr, DNS:st-microelectronics.asia, DNS:stm.hk, DNS:st-japan.biz, DNS:m.st.com, DNS:*.stmicroelectronics.st, DNS:st-microelectronics.kr, DNS:st-microelectronics.cn, DNS:stm32.jp, DNS:stmicro.co.kr, DNS:eu1.st.com, DNS:sitesearch.st.com, DNS:stm-korea.co.kr, DNS:st-japan.jpn.com, DNS:st-microelectronics.sg, DNS:stm-korea.com, DNS:discrete.st.com, DNS:stm32.org.cn, DNS:linear.st.com, DNS:stmicro.tw, DNS:st4sim.com, DNS:stmicroelectronics.asia

SHA-256 fingerprint

43:1E:DB:08:D9:9D:01:E9:16:EF:91:11:52:95:9C:BD:55:93:E2:5C:D6:C1:3D:90:73:4C:E1:03:71:8F:41:62
Certificate extensions & PEM
authorityKeyIdentifier
81:B8:0E:63:8A:89:12:18:E5:FA:3B:3B:50:95:9F:E6:E5:90:13:85
subjectKeyIdentifier
A5:B5:54:95:F3:41:B7:9B:97:5C:9A:88:AB:74:6F:BC:99:41:41:41
subjectAltName
DNS:*.atollic.com, DNS:stm-japan.jpn.com, DNS:stmicroelectronics.com.cn, DNS:st-microelectronics.jp, DNS:stmicro.jpn.com, DNS:stm32.io, DNS:eeprom.st.com, DNS:log.st.com, DNS:stmicroelectronics.co.kr, DNS:stm.xn--fiqs8s, DNS:stm32.com.my, DNS:stmicro.com.my, DNS:memory.st.com, DNS:mcu.st.com, DNS:st7.st.com, DNS:power.st.com, DNS:st-microelectronics.com.my, DNS:st-korea.co.kr, DNS:protonworld.st.com, DNS:stm32.hk, DNS:stm32cube.jp, DNS:stm.ph, DNS:st-microelectronics.xn--fiqs8s, DNS:st-korea.com, DNS:st-japan.jp, DNS:stm32.com.tw, DNS:st-microelectronics.hk, DNS:stmicro.xn--fiqs8s, DNS:stmicroelectronics.com.my, DNS:eprom.st.com, DNS:fr.st.com, DNS:st-microelectronics.com.tw, DNS:stm32cube.cn, DNS:stmicro.com.hk, DNS:st-microelectronics.com.cn, DNS:flash.st.com, DNS:st-korea.kr, DNS:stm32.ph, DNS:nvram.st.com, DNS:stm-korea.kr, DNS:st-microelectronics.com.sg, DNS:stm-japan.jp, DNS:stmicro.hk, DNS:stm-japan.biz, DNS:stm.my, DNS:stm.sg, DNS:stmicro.kr, DNS:stm.com.cn, DNS:stm32.asia, DNS:stmicroelectronics.com.ph, DNS:eu.st.com, DNS:stm.jpn.com, DNS:stm32.my, DNS:stm8.jp, DNS:stm32.com.ph, DNS:stm32.tw, DNS:stmicro.jp, DNS:micros.st.com, DNS:stmicro.sg, DNS:st-microelectronics.my, DNS:stmicroelectronics.com, DNS:stmicro.asia, DNS:stmicroelectronics.cn, DNS:psmdev.st.com, DNS:atollic.com, DNS:it.st.com, DNS:stmicro.com.sg, DNS:stmicroelectronics.com.hk, DNS:stm32.com.hk, DNS:stm.cn, DNS:stmicro.my, DNS:st-microelectronics.tw, DNS:st.com, DNS:st-microelectronics.com.hk, DNS:stm32.kr, DNS:*.touchgfx.com, DNS:stmicro.com.tw, DNS:st-microelectronics.co.kr, DNS:st-microelectronics.asia, DNS:stm.hk, DNS:st-japan.biz, DNS:m.st.com, DNS:*.stmicroelectronics.st, DNS:st-microelectronics.kr, DNS:st-microelectronics.cn, DNS:stm32.jp, DNS:stmicro.co.kr, DNS:eu1.st.com, DNS:sitesearch.st.com, DNS:stm-korea.co.kr, DNS:st-japan.jpn.com, DNS:st-microelectronics.sg, DNS:stm-korea.com, DNS:discrete.st.com, DNS:stm32.org.cn, DNS:linear.st.com, DNS:stmicro.tw, DNS:st4sim.com, DNS:stmicroelectronics.asia
certificatePolicies
Policy: 2.23.140.1.2.1
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.r2m01.amazontrust.com/r2m01.crl
authorityInfoAccess
OCSP - URI:http://ocsp.r2m01.amazontrust.com CA Issuers - URI:http://crt.r2m01.amazontrust.com/r2m01.cer
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Sep 22 00:13:35.916 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:7E:4D:20:06:18:6A:90:E7:1B:35:38:23: 23:36:25:65:51:40:62:AE:F0:C0:16:CA:E1:F7:7B:9D: 8D:65:29:C5:02:21:00:E6:7C:B3:5C:2B:F5:B6:0A:99: BC:7F:B8:36:D1:B5:A0:3C:74:E8:F3:93:0E:1B:C0:1A: 16:39:C0:EC:06:FF:48 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Sep 22 00:13:35.916 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F1:EE:64:6D:62:29:BF:1B:37:A2:C7: 67:19:E8:F5:B3:0B:A5:6A:CF:BC:D2:07:DD:C0:8C:00: E5:7E:C9:F9:34:02:21:00:9B:E9:01:08:2D:1C:F6:AB: 7A:A3:DD:6E:74:1F:59:D4:97:1B:EF:CC:7F:68:86:9D: 15:5F:AD:D9:20:7B:B3:0E Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Sep 22 00:13:35.961 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:9B:A4:4B:67:D7:99:02:7C:41:DD:0F: 8B:61:DE:FC:32:0C:07:13:0D:6C:F1:A8:33:82:98:68: 77:E4:5E:40:90:02:21:00:83:80:F1:88:34:5C:BC:AD: 06:43:4C:84:31:60:81:F7:F9:04:43:55:D4:FC:70:55: 61:01:CE:A0:4D:F6:AE:77
-----BEGIN CERTIFICATE-----
MIIMCTCCCvGgAwIBAgIQDqswpK8eNqce9zziQohlMjANBgkqhkiG9w0BAQsFADA8
MQswCQYDVQQGEwJVUzEPMA0GA1UEChMGQW1hem9uMRwwGgYDVQQDExNBbWF6b24g
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HrhjK4eZsy1qX/wkQBCVo8iJJQF8yoN1qeE3xwxpUyCefvqwI5KdqN2vfsVCbLHn
1erPouVD+EJTIraybHuQDHewtIebya/eG5MVdWjcaHaktSgA2JgJQ76s4yMZnsPk
ILDfbaCsLzSUWhTXSQ==
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-30T22:02:35+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Amazon CN=Amazon RSA 2048 M01
Issuer
C=US O=Amazon CN=Amazon Root CA 1
Valid from
2022-08-23T22:21:28+00:00
Expires
2030-08-23T22:21:28+00:00
Days remaining
1423
Serial (hex)
077312380B9D6688A33B1ED9BF9CCDA68E0E0F
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

53:38:EB:EC:8F:B2:AC:60:99:61:26:D3:E7:6A:A3:4F:D0:F3:31:8A:C7:8E:BB:7A:C8:F6:F1:36:1F:48:4B:33
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
subjectKeyIdentifier
81:B8:0E:63:8A:89:12:18:E5:FA:3B:3B:50:95:9F:E6:E5:90:13:85
authorityKeyIdentifier
84:18:CC:85:34:EC:BC:0C:94:94:2E:08:59:9C:C7:B2:10:4E:0A:08
authorityInfoAccess
OCSP - URI:http://ocsp.rootca1.amazontrust.com CA Issuers - URI:http://crt.rootca1.amazontrust.com/rootca1.cer
crlDistributionPoints
Full Name: URI:http://crl.rootca1.amazontrust.com/rootca1.crl
certificatePolicies
Policy: 2.23.140.1.2.1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=Amazon CN=Amazon Root CA 1
Issuer
C=US ST=Arizona L=Scottsdale O=Starfield Technologies, Inc. CN=Starfield Services Root Certificate Authority - G2
Valid from
2015-05-25T12:00:00+00:00
Expires
2037-12-31T01:00:00+00:00
Days remaining
4109
Serial (hex)
067F944A2A27CDF3FAC2AE2B01F908EEB9C4C6
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

87:DC:D4:DC:74:64:0A:32:2C:D2:05:55:25:06:D1:BE:64:F1:25:96:25:80:96:54:49:86:B4:85:0B:C7:27:06
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
84:18:CC:85:34:EC:BC:0C:94:94:2E:08:59:9C:C7:B2:10:4E:0A:08
authorityKeyIdentifier
9C:5F:00:DF:AA:01:D7:30:2B:38:88:A2:B8:6D:4A:9C:F2:11:91:83
authorityInfoAccess
OCSP - URI:http://ocsp.rootg2.amazontrust.com CA Issuers - URI:http://crt.rootg2.amazontrust.com/rootg2.cer
crlDistributionPoints
Full Name: URI:http://crl.rootg2.amazontrust.com/rootg2.crl
certificatePolicies
Policy: X509v3 Any Policy
-----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

Registration / WHOIS →DNS records →