marksandharrison.com
Observed Aug 16, 2026, 13:55 UTC (10h 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.
Mimecast
Let's Encrypt
Microsoft 365DomainDrift asked this domain for a TXT record at a name nobody registers, and got an answer back. A domain that answers a name that was never created is answering names in general, and that is wildcard DNS.
Wildcard DNS clusters around domain parking, dynamic DNS and catch-all hosting. It is also a real attack surface: if every invented hostname resolves, then a hostname an attacker invents resolves too, which is the ground state for subdomain takeover and for phishing hosted under a name that looks legitimate.
This is evidence of wildcard behaviour, not a proven fact. It rests on one control name: a domain could legitimately serve a TXT record at exactly that name for an unrelated reason, and a wildcard that answers address records but not TXT records would not be caught here at all. What this reading is and is not.
DNS Records
A 1
35.153.185.146
MX 2
10us-smtp-inbound-1.mimecast.com10us-smtp-inbound-2.mimecast.com
TXT 3
MS=ms11231099l68j0c5c6h699aet9p2treffd8v=spf1 include:_netblocks.mimecast.com ~all
NS 2
ns20.worldnic.comns19.worldnic.com
SOA 1
NS19.WORLDNIC.com namehost.WORLDNIC.com
MCP_RECORDS 1
v=spf1 include:_netblocks.mimecast.com ~all
DMARC_RECORDS 1
v=spf1 include:_netblocks.mimecast.com ~all
BIMI_RECORDS 1
v=spf1 include:_netblocks.mimecast.com ~all
MTA_STS_RECORDS 1
v=spf1 include:_netblocks.mimecast.com ~all
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
abogadomarksandharrison.com |
C=US, O=Let's Encrypt, CN=YR1 | Sun, 20 Sep 2026 08:33:54 +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 (4)
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; the only network request the check makes is for the published public keys.
Verify this receiptEd25519 Receipt
- Receipt ID
rcpt_d434d8f05cd1622e- Output Hash
b64e09ad6e284e54485c2bb1ecb7e6cc48d138a811c19b057b499d73b46ad2a1- Signature
ed25519:f6ce19c5d1a1c55ce73f6fb6f078aa20bfb0a90f7b9938fbbd8015ee4448f77b77d780cd25eb8bab0f70ad28c84e26c25e03fbb9594beaf48fb2b8bc4462a30d- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast