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diff --git a/src/x509-info/Cargo.toml b/src/x509-info/Cargo.toml
new file mode 100644
index 0000000..24f0478
--- /dev/null
+++ b/src/x509-info/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "x509-info"
+version = "0.1.0"
+edition = "2021"
+authors = ["Franck Cuny <franck@fcuny.net>"]
+description = "Print summary of x509 certificates."
+homepage = "https://github.com/fcuny/x509-info/"
+readme = "README.md"
+
+[dependencies]
+anyhow = "1.0.82"
+chrono = {version = "0.4.38", features = ["clock"], default-features = false }
+clap = {version = "4.5.8", features = ["derive", "cargo"]}
+rustls = {version = "0.23.8", features = ["ring"]}
+rustls-native-certs = "0.7.0"
+webpki-roots = "0.26.3"
+x509-parser = "0.16"
diff --git a/src/x509-info/README.md b/src/x509-info/README.md
new file mode 100644
index 0000000..a269ee5
--- /dev/null
+++ b/src/x509-info/README.md
@@ -0,0 +1,72 @@
+# x509-info
+
+At this point it's pretty clear that I'll never remember the syntax for `openssl` to show various information about a certificate. At last I will not have to google for that syntax ever again.
+
+## Usage
+
+``` shell
+$ Usage: x509-info [OPTIONS] <DOMAIN>
+
+Arguments:
+  <DOMAIN>
+          Domain to check
+
+Options:
+  -p, --port <PORT>
+          Port to check
+
+          [default: 443]
+
+  -i, --insecure
+          Accept invalid certificate
+
+  -f, --format <FORMAT>
+          [default: short]
+
+          Possible values:
+          - short: Format the output as one line of plain text
+          - long:  Format the output as plain text
+
+  -h, --help
+          Print help information (use `-h` for a summary)
+
+  -V, --version
+          Print version information
+```
+
+The default format will print a short message:
+
+``` shell
+$ x509-info twitter.com
+twitter.com: Mon, 11 Dec 2023 15:59:59 -0800 (257 days left)
+```
+
+It's possible to get more details:
+
+``` shell
+$ x509-info --format=long twitter.com
+certificate
+ version: V3
+ serial: 0a:2c:01:b8:2b:5d:47:73:9a:5a:01:1a:6f:dc:1a:20
+ subject: C=US, ST=California, L=San Francisco, O=Twitter, Inc., CN=twitter.com
+ issuer: C=US, O=DigiCert Inc, CN=DigiCert TLS RSA SHA256 2020 CA1
+ validity
+  not before    : Sat, 10 Dec 2022 16:00:00 -0800
+  not after     : Mon, 11 Dec 2023 15:59:59 -0800
+  validity days : 365
+  remaining days: 257
+ SANs:
+  DNS:twitter.com
+  DNS:www.twitter.com
+```
+
+You can also check expired certificates:
+
+``` shell
+$ x509-info --insecure expired.badssl.com
+<no name>: Sun, 12 Apr 2015 16:59:59 -0700 (it expired -2907 days ago)
+```
+
+## Notes
+
+Could the same be achieved with a wrapper around `openssl` ? yes.
diff --git a/src/x509-info/deny.toml b/src/x509-info/deny.toml
new file mode 100644
index 0000000..fd95cdb
--- /dev/null
+++ b/src/x509-info/deny.toml
@@ -0,0 +1,46 @@
+[advisories]
+db-path = "~/.cargo/advisory-db"
+db-urls = ["https://github.com/rustsec/advisory-db"]
+vulnerability = "deny"
+unmaintained = "warn"
+yanked = "warn"
+notice = "warn"
+ignore = []
+
+[licenses]
+unlicensed = "deny"
+allow = ["MIT", "Apache-2.0", "ISC", "Unicode-DFS-2016", "OpenSSL"]
+deny = []
+copyleft = "allow"
+default = "deny"
+confidence-threshold = 0.8
+exceptions = []
+
+[licenses.private]
+ignore = false
+registries = []
+
+# see https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html#example
+[[licenses.clarify]]
+name = "ring"
+expression = "MIT AND ISC AND OpenSSL"
+license-files = [
+    { path = "LICENSE", hash = 0xbd0eed23 }
+]
+
+[bans]
+multiple-versions = "warn"
+wildcards = "allow"
+highlight = "all"
+allow = []
+deny = []
+skip = []
+skip-tree = []
+
+[sources]
+unknown-registry = "warn"
+unknown-git = "warn"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = []
+
+[sources.allow-org]
diff --git a/src/x509-info/src/client.rs b/src/x509-info/src/client.rs
new file mode 100644
index 0000000..83e010c
--- /dev/null
+++ b/src/x509-info/src/client.rs
@@ -0,0 +1,110 @@
+use anyhow::{anyhow, Error};
+use rustls::client::danger::{HandshakeSignatureValid, ServerCertVerified, ServerCertVerifier};
+use rustls::crypto::{ring, verify_tls12_signature, verify_tls13_signature, CryptoProvider};
+use rustls::pki_types::{self, CertificateDer, ServerName, UnixTime};
+use rustls::{ClientConfig, ClientConnection};
+use rustls::{DigitallySignedStruct, SignatureScheme};
+
+use std::io::Write;
+use std::sync::Arc;
+
+#[derive(Debug)]
+struct NoCertificateVerification {}
+
+impl ServerCertVerifier for NoCertificateVerification {
+    fn verify_server_cert(
+        &self,
+        _end_entity: &CertificateDer<'_>,
+        _intermediates: &[CertificateDer<'_>],
+        _server_name: &pki_types::ServerName<'_>,
+        _ocsp_response: &[u8],
+        _now: UnixTime,
+    ) -> Result<ServerCertVerified, rustls::Error> {
+        Ok(ServerCertVerified::assertion())
+    }
+
+    fn verify_tls12_signature(
+        &self,
+        message: &[u8],
+        cert: &CertificateDer<'_>,
+        dss: &DigitallySignedStruct,
+    ) -> Result<HandshakeSignatureValid, rustls::Error> {
+        verify_tls12_signature(
+            message,
+            cert,
+            dss,
+            &ring::default_provider().signature_verification_algorithms,
+        )
+    }
+
+    fn verify_tls13_signature(
+        &self,
+        message: &[u8],
+        cert: &CertificateDer<'_>,
+        dss: &DigitallySignedStruct,
+    ) -> Result<HandshakeSignatureValid, rustls::Error> {
+        verify_tls13_signature(
+            message,
+            cert,
+            dss,
+            &ring::default_provider().signature_verification_algorithms,
+        )
+    }
+
+    fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
+        ring::default_provider()
+            .signature_verification_algorithms
+            .supported_schemes()
+    }
+}
+
+pub fn get_certificates(
+    domain: String,
+    port: u16,
+    insecure: bool,
+) -> Result<Vec<CertificateDer<'static>>, Error> {
+    let mut tcp_stream = std::net::TcpStream::connect(format!("{}:{}", domain, port))?;
+
+    let config = if insecure {
+        ClientConfig::builder()
+            .dangerous()
+            .with_custom_certificate_verifier(Arc::new(NoCertificateVerification {}))
+            .with_no_client_auth()
+    } else {
+        let root_store = rustls::RootCertStore {
+            roots: webpki_roots::TLS_SERVER_ROOTS.to_vec(),
+        };
+        ClientConfig::builder_with_provider(
+            CryptoProvider {
+                cipher_suites: vec![ring::cipher_suite::TLS13_CHACHA20_POLY1305_SHA256],
+                kx_groups: vec![ring::kx_group::X25519],
+                ..ring::default_provider()
+            }
+            .into(),
+        )
+        .with_protocol_versions(&[&rustls::version::TLS13])
+        .unwrap()
+        .with_root_certificates(root_store)
+        .with_no_client_auth()
+    };
+
+    let server_name = ServerName::try_from(domain.clone())
+        .expect("invalid DNS name")
+        .to_owned();
+
+    let mut conn = ClientConnection::new(Arc::new(config), server_name)?;
+    while conn.wants_write() {
+        conn.write_tls(&mut tcp_stream)?;
+    }
+
+    tcp_stream.flush()?;
+    while conn.is_handshaking() && conn.peer_certificates().is_none() {
+        conn.read_tls(&mut tcp_stream)?;
+        conn.process_new_packets()?;
+    }
+
+    match conn.peer_certificates() {
+        Some(c) => Ok(c.to_vec()),
+        None => Err(anyhow!("no certificate found for {}", domain))?,
+    }
+}
diff --git a/src/x509-info/src/main.rs b/src/x509-info/src/main.rs
new file mode 100644
index 0000000..d37ce0c
--- /dev/null
+++ b/src/x509-info/src/main.rs
@@ -0,0 +1,41 @@
+extern crate webpki_roots;
+
+mod client;
+mod output;
+
+use clap::Parser;
+use x509_parser::prelude::*;
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct Args {
+    /// Domain to check
+    domain: String,
+
+    /// Port to check
+    #[clap(short, long, default_value_t = 443)]
+    port: u16,
+
+    /// Accept invalid certificate
+    #[clap(short, long, default_value_t = false)]
+    insecure: bool,
+
+    #[clap(short, long,value_enum, default_value_t = output::OutputFormat::Short)]
+    format: output::OutputFormat,
+}
+
+fn main() {
+    let args = Args::parse();
+
+    match client::get_certificates(args.domain, args.port, args.insecure) {
+        Ok(certs) => {
+            let (_, cert) =
+                x509_parser::certificate::X509Certificate::from_der(certs[0].as_ref()).unwrap();
+            output::OutputFormat::print(args.format, cert);
+        }
+        Err(e) => {
+            println!("error: {}", e);
+            std::process::exit(1);
+        }
+    };
+}
diff --git a/src/x509-info/src/output.rs b/src/x509-info/src/output.rs
new file mode 100644
index 0000000..963ef20
--- /dev/null
+++ b/src/x509-info/src/output.rs
@@ -0,0 +1,120 @@
+use chrono::prelude::*;
+use std::net::{Ipv4Addr, Ipv6Addr};
+use x509_parser::prelude::*;
+
+/// How to format the output data.
+#[derive(PartialEq, Eq, Debug, Copy, Clone, clap::ValueEnum)]
+pub enum OutputFormat {
+    /// Format the output as one line of plain text.
+    Short,
+
+    /// Format the output as plain text.
+    Long,
+}
+
+impl OutputFormat {
+    pub fn print(self, cert: X509Certificate) {
+        match self {
+            Self::Short => {
+                self.short(cert);
+            }
+            Self::Long => {
+                self.to_text(cert);
+            }
+        }
+    }
+
+    fn short(self, cert: X509Certificate) {
+        let not_after = chrono::Local
+            .timestamp_opt(cert.validity().not_after.timestamp(), 0)
+            .unwrap();
+        let now: DateTime<Local> = Local::now();
+        let remaining = not_after - now;
+
+        if remaining >= chrono::Duration::zero() {
+            println!(
+                "{}: {} ({} days left)",
+                cert.subject()
+                    .iter_common_name()
+                    .next()
+                    .and_then(|cn| cn.as_str().ok())
+                    .unwrap_or("<no name>"),
+                not_after.to_rfc2822(),
+                remaining.num_days(),
+            );
+        } else {
+            println!(
+                "{}: {} (it expired {} days ago)",
+                cert.subject()
+                    .iter_common_name()
+                    .next()
+                    .and_then(|cn| cn.as_str().ok())
+                    .unwrap_or("<no name>"),
+                not_after.to_rfc2822(),
+                remaining.num_days(),
+            );
+        }
+    }
+
+    fn to_text(self, cert: X509Certificate) {
+        let not_before = chrono::Local
+            .timestamp_opt(cert.validity().not_before.timestamp(), 0)
+            .unwrap();
+        let not_after = chrono::Local
+            .timestamp_opt(cert.validity().not_after.timestamp(), 0)
+            .unwrap();
+        let now: DateTime<Local> = Local::now();
+        let remaining = not_after - now;
+        let validity_duration = not_after - not_before;
+
+        println!("certificate");
+        println!(" version: {}", cert.version);
+        println!(" serial: {}", cert.tbs_certificate.raw_serial_as_string());
+        println!(" subject: {}", cert.subject());
+        println!(" issuer: {}", cert.issuer());
+
+        println!(" validity");
+        println!("  not before    : {}", not_before.to_rfc2822());
+        println!("  not after     : {}", not_after.to_rfc2822());
+        println!("  validity days : {}", validity_duration.num_days());
+        println!("  remaining days: {}", remaining.num_days());
+
+        println!(" SANs:");
+        if let Some(subnames) = subject_alternative_name(cert) {
+            for name in subnames {
+                println!("  {}", name);
+            }
+        }
+    }
+}
+
+fn subject_alternative_name(cert: X509Certificate) -> Option<Vec<String>> {
+    let mut subnames = Vec::new();
+    if let Ok(Some(san)) = cert.subject_alternative_name() {
+        let san = san.value;
+        for name in &san.general_names {
+            let s = match name {
+                GeneralName::DNSName(s) => format!("DNS:{}", s),
+                GeneralName::IPAddress(b) => {
+                    let ip = match b.len() {
+                        4 => {
+                            let b = <[u8; 4]>::try_from(*b).unwrap();
+                            let ip = Ipv4Addr::from(b);
+                            format!("{}", ip)
+                        }
+                        16 => {
+                            let b = <[u8; 16]>::try_from(*b).unwrap();
+                            let ip = Ipv6Addr::from(b);
+                            format!("{}", ip)
+                        }
+                        l => format!("invalid (len={})", l),
+                    };
+                    format!("IP address:{}", ip)
+                }
+                _ => format!("{:?}", name),
+            };
+            subnames.push(s);
+        }
+    }
+    Some(subnames)
+}