Registered 17 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 71 ms.
Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

| A | 108.138.64.80 108.138.64.93 108.138.64.48 108.138.64.103 |
|---|---|
| AAAA | 2600:9000:2508:c00:12:e08a:be80:93a1 2600:9000:2508:9e00:12:e08a:be80:93a1 2600:9000:2508:bc00:12:e08a:be80:93a1 2600:9000:2508:1e00:12:e08a:be80:93a1 2600:9000:2508:1000:12:e08a:be80:93a1 2600:9000:2508:400:12:e08a:be80:93a1 2600:9000:2508:6c00:12:e08a:be80:93a1 2600:9000:2508:9000:12:e08a:be80:93a1 |
| MX | 10 mailstore1.secureserver.net 0 smtp.secureserver.net |
| NS | ns01.ttddnnss.com dns4.p08.nsone.net dns3.p08.nsone.net ns03.ttddnnss.com ns04.ttddnnss.com ns02.ttddnnss.com dns2.p08.nsone.net dns1.p08.nsone.net |
| TXT | v=spf1 include:thetradedesk.com -all 4e4b395d-044a-4e63-aa1a-f7bbdfd7e90a _globalsign-domain-verification=rchoGDWwF5orbqIOBKK13KAVOKC0iBc2IsfX2jzqEX MS=ms72201950 30d1bf7c-57ed-487a-9998-2f74ce7b0e2f _globalsign-domain-verification=KnmR_y2aB1x3iRK_rmagVgzw08k-QcFdSE52Q1xHTX |
| registrar | MarkMonitor Inc. |
|---|---|
| registered | 2010-03-29 |
| expires | 2028-03-29 |
| last changed | 2026-08-12 |
| owner | REDACTED FOR PRIVACY |
| nameservers | dns1.p08.nsone.net dns2.p08.nsone.net dns3.p08.nsone.net dns4.p08.nsone.net ns01.ttddnnss.com ns02.ttddnnss.com ns03.ttddnnss.com ns04.ttddnnss.com |
| status | client delete prohibited server delete prohibited client transfer prohibited server transfer prohibited client update prohibited server update prohibited |
| valid | yes |
|---|---|
| issuer | GlobalSign nv-sa |
| covers | *.adsrvr.org, adsrvr.org |
| protocol | TLSv1.3 |
Domain is not signed with DNSSEC
| SPF | pass v=spf1 include:thetradedesk.com -all |
|---|---|
| DMARC | pass policy reject |
| DKIM | none of 1 common selectors |
Whether mail claiming to be from this domain can be checked as genuine.
Green: clean. Red: listed. Grey: the list did not answer.
Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.
MCP: add https://how.is/mcp to Claude, Codex or Cursor
(one-line install) and ask for domain_trust on adsrvr.org.
Reference: /llms.txt.
Watch adsrvr.org. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.
Watch — $1 / 30 days