21run.com

Registration

Registrar

Key-Systems GmbH

Created

2010-06-03

Expires

2027-06-03 357 days left

Updated

2026-06-04

Name servers

• lily.ns.cloudflare.com
• merlin.ns.cloudflare.com

DNS records live

NS

• lily.ns.cloudflare.com
• merlin.ns.cloudflare.com

MX

• 10 mx.transip.email

Verified for

• Ahrefs
• Google

Email authentication strong

SPF

v=spf1 include:_spf.transip.email include:sendgrid.net include:_spf.exsilia.net include:_spf.eu.mailgun.org -all

strict (-all)

DMARC

v=DMARC1; p=reject; rua=mailto:dmarc@21run.com; ruf=mailto:dmarc@21run.com; fo=1;

policy: reject (enforced)

DKIM

• s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAywJYMKQOIlgLhnrvTIOyt6vQ8JLcKU91yrzCzDLoYRkpAJuCdnsPzuCgZNATTHOh9iyMSbtLVerNeWeSjH…
• s2: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDnLC98/r0GjGQ9Yz3Z2Kk6BC86j1DZ7317D3HNerv7SoYUhbfheeyJpdtwcu7wezX2fcPC+4Q1P609SspliwX+0H…

selectors probed

Certificate (current)

Full certificate history on crt.sh ↗

Linked from (4)

• hausarzt-landau.de×2
• asvkoeln.com×1
• ergomed-landau.de×1
• asv-koeln.de×1