harpercollins.com

Observed Jul 21, 2026, 19:19 UTC (1d ago). Every field below was attested with an Ed25519 signature at scan time. Catalog observation, re-checked on rotation — watch it for 5-minute checks.

Verify this receipt yourself + Watch this domain

Guarded by a firewall

Runs onCloudflare

Email byProofpoint

Secured byDigiCert

Registered withMarkMonitor Inc.

Also usesFigmaGoogle Search ConsoleAtlassianZoomDockerDocuSign

1 subdomain · media_entertainment

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

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

harpercollins.com

A / AAAA

23.227.38.65

Cloudflareserves the site

dmtu.mt.ns.els-gms.att.netdbru.br.ns.els-gms.att.net

att.netanswers its DNS

mxa-00596a01.gslb.pphosted.commxb-00596a01.gslb.pphosted.com

Proofpointreceives its email

TLS

harpercollins.com

DigiCert Incissued its certificate

DNS Records

A 1

23.227.38.65

MX 2

5mxa-00596a01.gslb.pphosted.com
5mxb-00596a01.gslb.pphosted.com

TXT 33

yahoo-verification-key=i+M9oi9b5+XYPU48wdxWhYtTSJpnVouSnI3IUqZq88I=
extensis-domain-verification=fb808a86-2bd8-4609-b6da-ee938a0b5625
doordash-verification=N8fQ7KYWS5swsnXabGRKOjeGIighbm
srjf85faf1ivlj2abkt967tdfd
shopify-verification-code=nZBi4zupnooVrmOOmRl9un6F5ZYuq9
gc-ai-domain-verification-ctbrt8=XloEYpi5FPEXK53iCdLQtkSRU
openai-domain-verification=dv-0nFS3ectycyfVyRNeTWKRZz3
figma-domain-verification=2f62cdb936c6fe21e979b91c99c54d82fb999e849a36aa4b2c5d05e3f7ffad82-1771355140
google-site-verification=jBGiywYAcKUeCPqNZsGSvr_C6RMCPh0Z9g73o-1sBVI
nmmBU9m0JKlQMzYMFSA/7LacnfwY0LsGTpiMcOsFM0jILtamuI3jvV2g3+O7KKOWO4rFfGHDmZWIO4IRD+zdlg==

NS 2

dmtu.mt.ns.els-gms.att.net
dbru.br.ns.els-gms.att.net

SOA 1

dbru.br.ns.els-gms.att.net rm-hostmaster.ems.att.com

SRV 3

expedge02.harpercollins.com:5060 p10
expedge02.harpercollins.com:5061 p10
mailservices.harpercollins.com:443 p0

TLS Certificates (3)

Common Name	Issuer	Expires
`harpercollins.com`	C=US, O=DigiCert Inc, 2.5.4.11=www.digicert.com, CN=GeoTrust TLS RSA CA G1	Sun, 06 Dec 2026 23:59:59 +0000
`GeoTrust TLS RSA CA G1`	C=US, O=DigiCert Inc, 2.5.4.11=www.digicert.com, CN=DigiCert Global Root G2	Tue, 02 Nov 2027 12:23:37 +0000
`DigiCert Global Root G2`	C=US, O=DigiCert Inc, 2.5.4.11=www.digicert.com, CN=DigiCert Global Root CA	Sun, 09 Nov 2031 23:59:59 +0000

Subdomains (1)

www.harpercollins.com

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 harpercollins.com. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_eb3f4c012865195c
Output Hash: 68403f32efc0bfde067f92af24aebe1f93a3ed5df1baaba3a2e9d3e360ae64b7
Signature: ed25519:5dc6a367131edf52d718ab29fa062acc345dab033751ca9a38325bdcc683e0ef47d2d3d048d0a350ed7132474c36586a6b5fa1214011f89c5762c3bda716600a
Public Key: ed25519:178c3bd0f57d9d64b83cc4630753381e1a465005a2bbba3d032371f24af0bfd8
Parent: (genesis)
Plane: fast

Verify this in your browser

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