Three UK · Domain Security

Three Uk Domain Security

Domain security

Domain security posture for Three UK, probed live across 1 host(s) and 1 registrable domain(s). 1 host(s) serve HTTPS (up to TLSv1.3); 1 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=quarantine).

TelecommunicationsUnited KingdomMobile Network OperatorNetwork APIsCAMARAGSMA Open Gateway5GBroadbandRoamingSIM SwapIdentity VerificationAge VerificationWholesaleMVNOPartner Gated

Transport & Host Security

www.three.co.uk
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 19 23:59:59 2026 GMT

Domain (DNS/Email) Security

three.co.uk
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: yes

Source

Domain Security

three-uk-domain-security.yml Raw ↑ 
generated: '2026-07-25'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.three.co.uk
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 19 23:59:59 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: three.co.uk
  dnssec: false
  caa:
  - 0 issue "digicert.com"
  - 0 issue "entrust.net"
  - 0 issue "letsencrypt.org"
  - 0 issue "pki.goog"
  - 0 issue "amazon.com"
  spf: true
  dmarc: true
  dmarc_policy: quarantine