prometheus.io
Overall grade based on: IPv4: 2 of 2 complete · IPv6: 2 of 2 complete
All 4 endpoints share identical configuration Select an IP for owner, ASN & location
A+ 104.21.60.220 IPv4 WHOIS › A+ 172.67.201.240 IPv4 WHOIS › A+ 2606:4700:3030::6815:3cdc IPv6 WHOIS › A+ 2606:4700:3030::ac43:c9f0 IPv6 WHOIS › Grade Breakdown
Protocol Support 95%
Key Exchange 90%
Cipher Strength 100%
Certificate 100%
Certificate has expired. This domain's SSL/TLS certificate is no longer valid and browsers will show security warnings to visitors.
Protocol Configuration
Supported Protocols
TLS 1.3
TLS 1.2
TLS 1.1
TLS 1.0
SSL 3
SSL 2
Negotiated Cipher
TLS_AES_256_GCM_SHA384
Protocol Details
| Connection | |
| ALPN | h2 http/1.1 |
| SNI Required | Yes |
| Supported Named Groups | x25519 secp256r1 secp384r1 (inferred) |
| Post-Quantum Key Exchange | Unknown |
| HTTP/3 (QUIC) | Unknown |
| Encrypted Client Hello | Unknown |
| Security Features | |
| Forward Secrecy | Yes (ECDHE / DHE) |
| Downgrade Prevention | Yes (legacy TLS disabled) |
| Secure Renegotiation | Unknown |
| Extended Master Secret | Unknown |
| OCSP Stapling | Unknown (measured on TLS 1.2 only) |
| HSTS | Yes |
| HSTS Preloading | Not preloadedSubmit → |
| Security Checks | |
| BEAST attack | Mitigated |
| POODLE (SSLv3) | No (SSL 3 not supported) |
| POODLE (TLS) | No |
| RC4 | No |
| SSL/TLS Compression | No (not supported by .NET TLS stack) |
| Heartbleed | Not tested |
Cipher Suite Analysis
| Cipher Suite | Hex | Key Exchange | FS | Bits | Strength |
|---|---|---|---|---|---|
| # TLS 1.3 | |||||
| TLS_AES_256_GCM_SHA384 | 0x1302 | ECDHE | FS | 256 | Secure |
| TLS_CHACHA20_POLY1305_SHA256 | 0x1303 | ECDHE | FS | 256 | Secure |
| TLS_AES_128_GCM_SHA256 | 0x1301 | ECDHE | FS | 128 | Secure |
Handshake Simulation
| Client | Protocol | Cipher Suite | Result |
|---|---|---|---|
| Chrome 120 / Win 11 | TLS 1.3 | TLS_AES_256_GCM_SHA384 | Success |
| Chrome 80 / Win 10 | TLS 1.3 | TLS_AES_256_GCM_SHA384 | Success |
| Firefox 115 / Win 10 | TLS 1.3 | TLS_AES_256_GCM_SHA384 | Success |
| iOS 17 / Safari | TLS 1.3 | TLS_CHACHA20_POLY1305_SHA256 | Success |
| macOS 14 / Safari | TLS 1.3 | TLS_AES_256_GCM_SHA384 | Success |
| Android 14 | TLS 1.3 | TLS_AES_128_GCM_SHA256 | Success |
| Chrome 69 / Win 7 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Chrome 49 / XP SP3 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 | Success |
| IE 11 / Win 10 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| IE 11 / Win 7 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Android 9.0 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Android 7.0 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Android 5.0 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 | Success |
| Android 4.4.2 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Java 11 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 | Success |
| Java 8u121 | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 | Success |
| Android 4.0.4 | - | - | No |
| Android 4.1.1 | - | - | No |
| Baidu Jan 2015 | - | - | No |
| Java 6 | - | - | No |
* Simulated based on server's supported protocols and cipher configuration.
Certificate Identity
| Common Name | prometheus.io |
| Alt Names | prometheus.io *.prometheus.io |
| Issuer | CN=WE1, O=Google Trust Services, C=US |
| Validity | 2026-06-03 to 2026-09-01 (69 days ago — expired) |
| Key | ECDSA 256 bits (sha256ECDSA) |
| Serial Number | 63788B9E6A0FF5530E8318026202DE65 |
| SHA256 Fingerprint | d2caaca773a055191fb8d5595ad01da82e5c47bbb3bcff2d7f4e79926c074661 |
| Pin SHA256 | FgPwJDr04lPHr6c7GJY/0unxl7Aa1QndBg0S5WVuS8k= |
Certificate Properties
| Type | DV |
| Cert Transparency | Yes (SCT) |
| OCSP Must Staple | No |
| Revocation | Good (not revoked) OCSP: http://o.pki.goog/s/we1/Y3g |
| DNS CAA | Yes (configured) |
| Trusted By | Yes Mozilla · Apple · Android · Java · Windows |
| Validity Period | 90 days (maximum 200 days for certificates issued then) |
| Chain Issues | • Contains anchor (root CA included in chain) |
Trust Chain Architecture
End-Entity Certificate
CN=prometheus.io (Issuer: CN=WE1, O=Google Trust Services, C=US)
Intermediate CA
CN=WE1, O=Google Trust Services, C=US (Issuer: CN=GlobalSign, O=GlobalSign, OU=GlobalSign ECC Root CA - R4)
Root Certificate
CN=GlobalSign, O=GlobalSign, OU=GlobalSign ECC Root CA - R4 (Issuer: CN=GlobalSign, O=GlobalSign, OU=GlobalSign ECC Root CA - R4)
TLS History & Relations
Everything our scans have seen for prometheus.io, first seen 2026-06-08; current certificate since 2026-06-08.
Certificates served
| Certificate (SHA-256) | Issuer | Valid | Served |
|---|---|---|---|
| d2caaca773a05519… current | WE1 | 2026-06-03 → 2026-09-01 | 2026-06-08 |
Addresses
| Address | Certificate | Seen |
|---|---|---|
| 104.21.60.220 | d2caaca773a05519… | 2026-06-08 |
| 172.67.201.240 | d2caaca773a05519… | 2026-06-08 |
| 2606:4700:3030::6815:3cdc | d2caaca773a05519… | 2026-06-08 |
| 2606:4700:3030::ac43:c9f0 | d2caaca773a05519… | 2026-06-08 |
TLS history (a row per change; repeated checks only extend it)
| Since → last checked (UTC) | Grade | TLS | Certificates | Addresses |
|---|---|---|---|---|
| 2026-06-08 13:08 | A+ | TLS 1.3 | d2caaca773a05519… | 104.21.60.220, 172.67.201.240, 2606:4700:3030::6815:3cdc, 2606:4700:3030::ac43:c9f0 |