Let's Encrypt/ACME client and library written in Go
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Let's Encrypt client and ACME library written in Go.

Go Reference Build Status Docker Pulls


  • ACME v2 RFC 8555
    • Support RFC 8737: TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
    • Support RFC 8738: certificates for IP addresses
    • Support draft-ietf-acme-ari-01: Renewal Information (ARI) Extension
  • Register with CA
  • Obtain certificates, both from scratch or with an existing CSR
  • Renew certificates
  • Revoke certificates
  • Robust implementation of all ACME challenges
    • HTTP (http-01)
    • DNS (dns-01)
    • TLS (tls-alpn-01)
  • SAN certificate support
  • CNAME support by default
  • Comes with multiple optional DNS providers
  • Custom challenge solvers
  • Certificate bundling
  • OCSP helper function


How to install.



Documentation is hosted live at

DNS providers

Detailed documentation is available here.

Akamai EdgeDNS Alibaba Cloud DNS all-inkl Amazon Lightsail
Amazon Route 53 ArvanCloud Aurora DNS Autodns
Azure (deprecated) Azure DNS Bindman Bluecat
Brandit Bunny Checkdomain Civo CloudDNS Cloudflare ClouDNS
CloudXNS ConoHa Constellix Derak Cloud Designate DNSaaS for Openstack Digital Ocean DNS Made Easy DNSimple DNSPod (deprecated) Domain Offensive (
Domeneshop DreamHost Duck DNS Dyn
Dynu EasyDNS Efficient IP Epik
Exoscale External program G-Core
Gandi Live DNS (v5) Gandi Glesys Go Daddy
Google Cloud Google Domains Hetzner
Hosttech HTTP request Hurricane Electric DNS
HyperOne IBM Cloud (SoftLayer) IIJ DNS Platform Service Infoblox
Infomaniak Internet Initiative Japan INWX
Ionos IPv64 iwantmyname Joker
Joohoi's ACME-DNS Liara Linode (v4) Liquid Web
Loopia LuaDNS Manual Metaname MythicBeasts Namecheap
Namesilo NearlyFreeSpeech.NET Netcup Netlify
Nicmanager NIFCloud Njalla Nodion
NS1 Open Telekom Cloud Oracle Cloud OVH Porkbun PowerDNS Rackspace
RcodeZero RFC2136 RimuHosting
Sakura Cloud Scaleway Selectel Servercow Sonic Stackpath Tencent Cloud DNS
TransIP UKFast SafeDNS Ultradns Variomedia
VegaDNS Vercel Versio.[nl/eu/uk] VinylDNS
VK Cloud Vscale Vultr Websupport
WEDOS Yandex 360 Yandex Cloud Yandex PDD Zonomi

If your DNS provider is not supported, please open an issue.

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