extension.harvard.edu

Observed Jul 24, 2026, 02:50 UTC (4h 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

Up right now

Runs onFastly

Email byProofpoint

Secured byLet's Encrypt

Also usesGoogle Search Console

IPv6 · 3 subdomains · push_legacy

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

INFRASTRUCTURE MAPwhat extension.harvard.edu actually stands on - every host below is a signed observation

extension.harvard.edu

A / AAAA

23.185.0.12620:12a:8000::12620:12a:8001::1

Fastlyserves the site

a10-66.akam.neta7-65.akam.neta6-66.akam.neta16-64.akam.net+2 more

akam.netanswers its DNS

mx0b-00171101.pphosted.commx0a-00171101.pphosted.com

Proofpointreceives its email

TLS

alumni.extension.harvard.edu

Let's Encryptissued its certificate

DNS Records

A 1

23.185.0.1

AAAA 2

2620:12a:8000::1
2620:12a:8001::1

MX 2

100mx0b-00171101.pphosted.com
100mx0a-00171101.pphosted.com

TXT 8

google-site-verification=tzmjMGjzKQVBgEZzniAHdkyyh7E3bwl6wAgf0kIfTQM
openai-domain-verification=dv-VUo8zaxeVwykPdyNqwwDoWXi
v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
google-site-verification=y1KmMSc7jtK8BUkTSVvhvf4LqRL3OPz3Zy5YKr-VZBE
anthropic-domain-verification-yma60b=iIYn7CygYmxD9f8ynJOmz5Z5V
google-site-verification=KTzOUo7gPXWp3jvnDRB5lCXzpGx2Sh7Osjm_5Pvixa0
v=DMARC1; p=quarantine; rua=mailto:dmarc_agg@vali.email
v=BIMI1; l=https://extension.harvard.edu/wp-content/uploads/sites/8/2024/01/EXT_Shield_Bimi.svg

NS 6

a10-66.akam.net
a7-65.akam.net
a6-66.akam.net
a16-64.akam.net
a1-171.akam.net
a11-67.akam.net

SOA 1

a1-171.akam.net netmanager.harvard.edu

SRV 2

dcedecode2.dce.harvard.edu:5222 p10
dcedecode2.dce.harvard.edu:5269 p10

TLS Certificates (3)

Common Name	Issuer	Expires
`alumni.extension.harvard.edu`	C=US, O=Let's Encrypt, CN=YR1	Fri, 11 Sep 2026 15:20:28 +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 (3)

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 extension.harvard.edu. It updates itself. It attests a signed observation - not that the site is safe.

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

Ed25519 Receipt

Receipt ID: rcpt_8fa6c815a585511e
Output Hash: be41c950e7cd996db44242db895880d833238077e53f13f75743acf628b59c67
Signature: ed25519:8e566d0de893d557f672e0d5c474fd31d0a9cc804ccc26685728876271c534611d5e66f30fffa0f9657dd555a49ef2ca7d4c97385392b4a173a24da1fdfe980d
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

Verify this in your browser

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