cogentco.com

Observed Jul 18, 2026, 13:04 UTC (1d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCogent Communications

Email byMicrosoft 365

Secured byLet's Encrypt

Registered withNetwork Solutions, LLC

Also usesZoom

IPv6 · tranco_20k

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat cogentco.com actually stands on - every host below is a signed observation

cogentco.com

A / AAAA

38.100.128.102001:550:1::cc01

Cogent Communicationsserves the site

auth1.dns.cogentco.comauth2.dns.cogentco.com

cogentco.comanswers its DNS

cogentco-com.mail.protection.outlook.com

Microsoft 365receives its email

TLS

cogentco.com

Let's Encryptissued its certificate

DNS Records

A 1

38.100.128.10

AAAA 1

2001:550:1::cc01

MX 1

5cogentco-com.mail.protection.outlook.com

TXT 8

cisco-ci-domain-verification=563e6ea9960b89d45e298278ab2c8f2ed5c7bea8277648dd997262491c1f4fd
ZOOM_verify_6LoiHccIcBeiFmEkJmfiR4
v=spf1 mx a:engtools.sys.cogentco.com a:mx1.cogentco.com a:mx2.cogentco.com a:mx3.cogentco.com a:mx4.cogentco.com a:mx5.cogentco.com ip6:2001:550:1:304::247 include:cvent-planner.com include:_spf.act-on.net ~all
cofnduj090qcu5jbup8c39bovo
ifs3oocjo6h5920nr11c1325f9
2btc923933rlmtmu3eie8bpc65
adobe-idp-site-verification=f26b18445e54e1e7da0ebc2c299a9f1c63820cf9ab98c8be839829c2247503cc
v=DMARC1; p=none;

NS 2

auth1.dns.cogentco.com
auth2.dns.cogentco.com

SOA 1

auth1.dns.cogentco.com dns.cogentco.com

TLS Certificates (3)

Common Name	Issuer	Expires
`cogentco.com`	C=US, O=Let's Encrypt, CN=YR1	Tue, 08 Sep 2026 04:23:55 +0000
`YR1`	C=US, O=ISRG, CN=Root YR	Sat, 02 Sep 2028 23:59:59 +0000
`Root YR`	C=US, O=Internet Security Research Group, CN=ISRG Root X1	Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (0)

None observed.

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for cogentco.com. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/cogentco.com">
  <img src="https://domaindrift.io/badge/cogentco.com.svg"
       width="300" height="64" alt="DomainDrift signed observations for cogentco.com">
</a>

Ed25519 Receipt

Receipt ID: dc10e048-b597-4c44-b128-908b9cd12950
Output Hash: d7f6c992ed569bce34d78344e358f6af20fb1b7f01ff8a2184d024f2ee8e4dc0
Signature: ed25519:f20af4132b9c82714838250e071dfc3d14eea73a9a1a730e97cea260aa9fc6d722232f9a62a2f0a9bf78bef145ba25d92c247c596a512aafdb91abfe4c7d7e0c
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/cogentco.com