Bulk-check DNS, SSL and email auth for a whole list of domains (no scraping)

weiseer Posted on May 31 Bulk-check DNS, SSL and email auth for a whole list of domains (no scraping) # security # devops # productivity # webdev If you've ever had a spreadsheet of domains — a lead list, an acquisition target's footprint, your own portfolio — and needed DNS records, WHOIS, SSL expiry, or email authentication for all of them, you know the pain: single-domain web tools don't scale, and dig / whois / openssl loops are fiddly to parse. Here's how I think about pulling clean, structured domain intelligence in bulk — and the three small tools I built so I never have to write that loop again. 1. DNS + WHOIS + SSL, in one pass For each domain you usually want three things together: DNS — A/AAAA/MX/NS/TXT/CNAME (where it points, who runs mail, the DNS provider) WHOIS — registrar, creation/expiry dates, status, name servers SSL — issuer, the valid_from / valid_to window, SAN list The trick is to do them as protocol calls (DNS resolution, a TLS handshake, WHOIS on port 43) rather than scraping any website — protocol surfaces are stable, so the output doesn't break when sites redesign. If you don't want to wire that yourself, I packaged it as Domain Intelligence on Apify : paste a list of domains, get one clean JSON row each. ($0.01/domain, no proxies.) 2. Email authentication (MX / SPF / DMARC / DKIM) Deliverability and security both hinge on the same DNS records: MX present? which provider? ( aspmx.l.google.com → Google Workspace, etc.) SPF — is there a v=spf1 TXT record, and is the qualifier -all (strict) or ~all ? DMARC — _dmarc TXT with p=reject / quarantine / none ? DKIM — does a common selector ( google , selector1 , k1 …) publish a key at <selector>._domainkey.<domain> ? A domain with MX + SPF -all + DMARC reject + DKIM is a "strong" setup; missing DMARC is the most common gap. You can score a whole list this way in seconds — no SMTP probing required (which mail servers block anyway). I put this in Bulk Email Deliverability Checker . 3. The