DKIM check for a domain: tests the most common DKIM selectors (google, selector1/selector2 for Microsoft 365, default, k1, mail, dkim, s1, s2, mandrill, mailchimp, sendgrid, zoho, amazonses and more) or a selector you give as domain:selector, and returns any public keys found. Email authentication audit. $0.01 per domain.

DMARC record check for a domain: fetches _dmarc TXT, parses policy (none/quarantine/reject), subdomain policy, percentage, aggregate and forensic report addresses, alignment modes, and flags a non-enforcing or missing policy. Email spoofing protection audit. $0.01 per domain.

From an email address to its company: runs the full domain-intel report on the address's domain (registration, DNS, homepage title and description, social profiles, tech stack, trust score) and flags free/disposable providers. Lead enrichment from a single email. $0.01 per address.

Extract every email address from a block of text: deduplicated, lowercased, syntax-validated, with a per-domain count. Turn scraped pages, documents or logs into a clean contact list. $0.01 per call (text up to 50 KB).

Gravatar check: whether an email address has a public Gravatar avatar and profile (via the SHA-256 hash, no data sent to third parties beyond the hash), with the avatar and profile URLs. Enrich contacts with a real avatar. $0.01 per address.

Email list hygiene report for up to 50 addresses in one $0.01 call: duplicates, invalid syntax, disposable domains, role addresses, free-webmail share, domains without MX, and a keep / review / remove split. Clean a signup or CRM list before sending.

MTA-STS and TLS-RPT check for a domain: the _mta-sts DNS record, the published policy file (mode enforce/testing/none, allowed MX, max_age) fetched from mta-sts.<domain>, and the _smtp._tls TLS reporting record. Tells you if inbound email is protected against downgrade attacks. $0.01 per domain.

Email normalizer: lowercases, strips plus-tags, applies provider rules (Gmail ignores dots, googlemail.com = gmail.com, outlook/hotmail/yahoo/proton/fastmail +tags) and returns a canonical form for deduplicating contact lists and detecting duplicate signups. $0.01 per address.

Email provider detection for an address or domain: consumer webmail (Gmail, Outlook.com, Yahoo, iCloud, Proton...) versus business hosting (Google Workspace, Microsoft 365, Zoho, Proofpoint...) from the domain and its MX records. Segment contacts and pick the right deliverability playbook. $0.01 per address.

Role-address detection: is an email a generic mailbox (info@, support@, sales@, billing@, admin@, noreply@...) rather than a person? Returns the role, its category (support, sales, technical, legal, no-reply) and whether it is likely a personal address. CRM hygiene and outreach targeting. $0.01 per address.

SPF record check for a domain: fetches and parses the SPF record (all qualifier, includes, ip4/ip6, a, mx, redirect), counts DNS-lookup mechanisms against the 10-lookup limit by expanding includes, flags duplicate records and common errors. Email deliverability and anti-spoofing audits. $0.01 per domain.

Can this domain be spoofed? Checks whether SPF and DMARC together actually block forged mail: missing DMARC, p=none, pct below 100, SPF +all or ?all, or no SPF at all mean attackers can send email as the domain. Returns a risk level with reasons. Phishing-risk assessment. $0.01 per domain.

Fast email syntax check (no DNS): validates local part and domain shape per RFC 5322 practical rules, flags leading/trailing/double dots, invalid characters, missing TLD and length limits. Sub-millisecond input validation for forms and agents. $0.01 per address.

Hostname to IPs with hosting attribution: all IPv4 and IPv6 addresses for a hostname, and for each IPv4 the ASN, network owner, country and detected cloud/hosting provider. Where is this site hosted, in one call. $0.01 per hostname.

HTTP security headers check for a website: HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, plus server and content-type headers, status and final URL. Web security audit, compliance checks and hardening reports. $0.01 per URL.

IP reputation check: is this IP address on spam or abuse blocklists (DNSBL lookups across major lists), is it a Tor exit node, and does it belong to a cloud or hosting provider (datacenter IP) rather than a residential network. Returns a risk label (clean / suspicious / bad) with the reasons. Fraud screening, signup risk and firewall decisions. $0.01 per IP.

IP to ASN lookup: the autonomous system number and name that announces an IP, the BGP prefix, country code, regional registry and allocation date (Team Cymru data via DNS). Network attribution for logs, security and analytics. $0.01 per IP.

ASN lookup: the name, country, regional registry and allocation date of an autonomous system (Team Cymru), plus the RDAP record with the owning organization. Identify who operates a network number seen in logs or BGP data. $0.01 per ASN.

Announced IP prefixes for an ASN: IPv4 and IPv6 ranges currently announced in BGP (from RIPEstat, free), with counts and samples. Build allowlists, map a company's network footprint or attribute traffic. $0.01 per ASN.

Bulk IP enrichment: up to 20 IPv4 addresses in one $0.01 call, each with public/private classification, ASN and owner, country, reverse DNS and cloud provider. Enrich a log or firewall export at a twentieth of the per-IP price.

CIDR / subnet calculator: network and broadcast address, first and last usable host, netmask and wildcard mask, total and usable address counts for any IPv4 CIDR block. Network planning and validation. $0.01 per calculation.

Cloud / hosting provider detection for an IP or hostname: AWS, Google Cloud, Azure, Cloudflare, DigitalOcean, Hetzner, OVH, Akamai/Linode, Fastly, Oracle, Alibaba, Vultr, Fly.io, Render and others, from the announcing ASN, plus a CDN flag. Where is this service hosted? $0.01 per lookup.

IPv6 normalizer: expand any IPv6 address to its full 8-group form and back to the canonical compressed form (RFC 5952), with type classification (global unicast, link-local, unique local, loopback, multicast, IPv4-mapped). Deduplicate and compare addresses reliably. $0.01 per address.

IP to country: the country an IPv4 address is registered to, from the regional internet registry (via Team Cymru and RDAP), with ASN context. Honest about what it is: registry data, not precise geolocation, and free of any keyed geo-IP database. $0.01 per IP.

Check whether an IPv4 address belongs to a CIDR block. Give '<ip> in <cidr>' (or comma separated). Firewall rule validation, allowlist checks and log filtering. $0.01 per check.

IP address intelligence in one call: reverse DNS hostname, ASN number and owner name, announced prefix, country and regional registry from Team Cymru, RDAP network name and organization, private/bogon classification and cloud provider detection (AWS, Google, Azure, Cloudflare...). Log enrichment, abuse triage and infrastructure mapping. $0.01 per IP.

IPv6 readiness check for a domain: AAAA records for the site, IPv6 on its mail exchangers and on its nameservers, and whether it is dual-stack. Compliance and modernization audits. $0.01 per domain.

Is this IP a CDN or reverse proxy? Detects Cloudflare, Akamai, Fastly, CloudFront, Imperva/Incapsula, Sucuri, StackPath, Bunny, KeyCDN, Gcore and others from the announcing network, so you know whether an address is the origin server or an edge. $0.01 per lookup.

Tor exit node check: whether an IPv4 address is a current Tor exit, from the Tor Project's published exit list (cached one hour). Fraud screening, abuse triage and access policy decisions. $0.01 per IP.

Common ports scan: TCP-connects to 12 well-known ports (FTP 21, SSH 22, SMTP 25, HTTP 80, HTTPS 443, MySQL 3306, Postgres 5432, Redis 6379, 8080, 8443, Elasticsearch 9200, MongoDB 27017) and reports which are open. Quick exposure check for a host you operate. Cloudflare-fronted hosts cannot be probed. $0.01 per host.

IP address classification: is it a valid IPv4, and is it public or private/RFC1918, loopback, link-local, CGNAT shared space, multicast, documentation or reserved (bogon)? Input validation and log filtering. $0.01 per IP.

IP range to CIDR converter: turns any IPv4 start-end range into the minimal list of CIDR blocks that cover it exactly, with the address count. Firewall and allowlist preparation. $0.01 per range.

IP WHOIS via RDAP: the registered netblock for an address with its name, handle, allocation type, country, start and end addresses and the owning organization, from the authoritative regional registry. Ownership research and abuse contacts. $0.01 per IP.

Subnet splitter: divide an IPv4 CIDR block into equal subnets of a smaller prefix (e.g. a /22 into /24s), listing up to 256 resulting networks with counts. VPC and VLAN planning. $0.01 per split.

IP address validator: tells you whether a string is a valid IPv4 or IPv6 address, which version, the normalized form and its classification (public, private, loopback, link-local, multicast...). Input validation for forms, logs and APIs. $0.01 per check.

Is this website up? Checks if a URL is online right now and answers up/down with the HTTP status code, response time in ms, final URL after redirects, server header and, when HTTPS, the TLS certificate expiry. Use it to check if a site is down, monitor availability, or confirm a page loads before scraping. $0.01 per check.

Free audiobook finder: public-domain audiobooks from LibriVox (volunteer-read, mp3) with runtime, language, genres and direct zip / RSS / archive.org links, plus audio items from Internet Archive. $0.01 per search.

Free Action & Adventure audiobooks: public-domain recordings in LibriVox's "Action & Adventure" genre (561 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Action & Adventure Fiction audiobooks: public-domain recordings in LibriVox's "Action & Adventure Fiction" genre (1021 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Animals & Nature audiobooks: public-domain recordings in LibriVox's "Animals & Nature" genre (418 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Anthologies audiobooks: public-domain recordings in LibriVox's "Anthologies" genre (419 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Biography & Autobiography audiobooks: public-domain recordings in LibriVox's "Biography & Autobiography" genre (873 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Children's Fiction audiobooks: public-domain recordings in LibriVox's "Children's Fiction" genre (626 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Christianity - Other audiobooks: public-domain recordings in LibriVox's "Christianity - Other" genre (667 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Crime & Mystery Fiction audiobooks: public-domain recordings in LibriVox's "Crime & Mystery Fiction" genre (474 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Detective Fiction audiobooks: public-domain recordings in LibriVox's "Detective Fiction" genre (595 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Essays & Short Works audiobooks: public-domain recordings in LibriVox's "Essays & Short Works" genre (659 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free General Fiction audiobooks: public-domain recordings in LibriVox's "General Fiction" genre (1166 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free Historical Fiction audiobooks: public-domain recordings in LibriVox's "Historical Fiction" genre (916 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.

Free History audiobooks: public-domain recordings in LibriVox's "History" genre (553 titles and growing) with runtime, language and direct mp3 zip / RSS / archive.org links, plus matching audio from Internet Archive. Add words to narrow by title or author. Re-verified daily. $0.01 per page of 20.