usmle.org
Observed Jul 27, 2026, 22:49 UTC (5d 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.
Up right now
Email byProofpoint
Secured byLet's Encrypt
1 subdomain · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat usmle.org actually stands on - every host below is a signed observation
usmle.org
A / AAAA
23.185.0.1
unattributedserves the site
NS
edns1.ultradns.bizedns1.ultradns.comedns1.ultradns.netedns1.ultradns.org
ultradns.biz + ultradns.com + moreanswers its DNS
MX
mxa-001bed01.gslb.pphosted.commxb-001bed01.gslb.pphosted.com
Proofpointreceives its email
TLS
usmle.org
Let's Encryptissued its certificate
DNS Records
A 1
23.185.0.1
MX 2
10mxa-001bed01.gslb.pphosted.com20mxb-001bed01.gslb.pphosted.com
TXT 3
MS=ms66708223v=spf1 mx include:spf-001bed01.pphosted.com include:_spf.salesforce.com include:mktomail.com ~allv=DMARC1;p=quarantine;fo=1;rua=mailto:vlaapw63@ag.us.dmarcian.com, mailto:UsmleDMARCRecordReports@usmle.org;ruf=mailto:UsmleDMARCRecordReports@usmle.org
NS 4
edns1.ultradns.bizedns1.ultradns.comedns1.ultradns.netedns1.ultradns.org
SOA 1
a1.verisigndns.com dnssupport.verisign-grs.com
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
usmle.org |
C=US, O=Let's Encrypt, CN=YR1 | Sun, 11 Oct 2026 03:50:06 +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 (1)
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 receiptPut the receipt on your own site. A live badge showing what DomainDrift observes and signs for usmle.org. It updates itself. It attests a signed observation - not that the site is safe.
<a href="https://domaindrift.io/t/usmle.org">
<img src="https://domaindrift.io/badge/usmle.org.svg"
width="300" height="64" alt="DomainDrift signed observations for usmle.org">
</a>
Ed25519 Receipt
- Receipt ID
rcpt_b1c7db63d3b86711- Output Hash
14fa055043fbd3ed7cb2b15ddfa634bb02ffc1cdf96511ec332bef6b79eb6e99- Signature
ed25519:b7f7bc9dfb498a670bf31fdb6fcb4b57a0a8bdb5a54d17eef8234427912ce39b46aec26019a660b611917358b8c39effeb4e8bb34ad2b2c00095812dc1587202- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast