Robtex

Returns the most recently opened Lightning Network channels, sorted by open time descending.

Check an IP address reputation against 100+ real-time blocklists (DNSBLs). Returns listing status, threat categories, AS info, and blocklist details.

Lookup DNS records (A, AAAA, MX, NS, TXT, CNAME, SOA) for a given hostname. Also returns domain reputation info (Majestic, Tranco rankings, blocklist status).

Find hostnames that use a specific DNS record value. Query which hostnames point to an IP address, use a particular nameserver, or reference any DNS value. For example: 'which hostnames point to 1.2.3.4?' or 'which hostnames use chris.ns.cloudflare.com as their nameserver?'

Find hostnames that use a specific mail server. For example: which hostnames use aspmx.l.google.com as their mail server?

Find hostnames that use a specific nameserver. For example: which hostnames use chris.ns.cloudflare.com as their nameserver?

Find hostnames that point to a specific IP address (IPv4 or IPv6). Searches both A and AAAA records. For example: which hostnames point to 1.2.3.4?

Find hostnames that *previously* used a specific nameserver but no longer do. Tracks infrastructure migrations and past delegation relationships.

Find hostnames that *previously* used a specific mail server but no longer do. Tracks email provider migrations and past MX relationships.

Find hostnames that *previously* pointed to a specific IP address but no longer do. Tracks hosting migrations and past IP relationships. Searches both A and AAAA records.

Look up the manufacturer/vendor of a network device by its MAC address. Uses the official IEEE OUI (Organizationally Unique Identifier) database with ~30K entries.

Lookup WHOIS information for an Autonomous System (AS) number from the RADB routing database. Returns routing policy, network information, and administrative contacts.

Lookup a Lightning Network node by public key. Returns node alias, peer count, channel count, and centrality ranking.

Lookup a Lightning channel by channel ID. Supports numeric, block x txn x vout, or block:txn:vout formats.

Lookup all Lightning Network channels for a given node by public key.

Get recommended Lightning Network peers for a given node. Returns nodes that are NOT currently peered with the specified node but would improve its centrality score if connected.

Search for Lightning Network nodes by partial alias match. Returns nodes whose aliases contain the search term (case-insensitive).

Queries the authoritative RDAP registry for a domain. Returns availability status (HTTP 404 = available), and for registered domains: registrar name, registration/expiration dates, nameservers, DNSSEC status, and domain status flags. Uses IANA bootstrap to find the correct RDAP server per TLD. Covers 590+ TLDs.

Parse a hostname into its constituent parts using the Mozilla Public Suffix List (9700+ entries). Returns eTLD (effective TLD), registered domain, subdomain, labels, and depth. Handles multi-level eTLDs (co.uk, co.jp, com.au) and platform suffixes (github.io, herokuapp.com).

Check whether a hostname is a subdomain (has labels beyond the registered domain). Uses the Mozilla Public Suffix List for accurate eTLD detection.

Extract the registered domain (eTLD+1) from a hostname. For example, www.mail.example.co.uk returns example.co.uk.

Get information about a top-level domain or effective TLD. Returns whether it is in the Public Suffix List, how many sub-suffixes exist, and classification (ccTLD, gTLD, or infrastructure).

Look up A (IPv4 address) records for a hostname.

Look up AAAA (IPv6 address) records for a hostname.

Look up MX (mail exchange) records for a hostname. Returns mail servers and their priorities.

Look up NS (nameserver) records for a hostname.

Look up TXT records for a hostname. Includes SPF, DKIM, DMARC, domain verification, and other text records.

Look up CNAME (canonical name / alias) records for a hostname.

Look up SOA (Start of Authority) record for a hostname. Returns primary nameserver, admin email, serial number, and timing values.

Look up PTR (reverse DNS) record for an IP address. Returns the hostname associated with the IP.

Find hostnames that have a CNAME record pointing to the specified target. Useful for CDN and load balancer investigations.

Find hostnames that previously had a CNAME record pointing to the specified target but no longer do. Tracks CDN and infrastructure migrations.

Get geographic location data for an IP address: country, city, region, latitude, longitude, timezone.

Get the containing network (BGP route), AS number, AS name, and route description for an IP address.

Lightweight lookup: get just the AS number and netblock for an IP address. Fastest way to map IP to ASN.

Check an IP address against IPsum, FireHOL, Tor exit node lists, C2 indicators, Roskomnadzor (Russia), and other threat intelligence feeds. Returns which lists the IP appears on and threat scores.

Combined threat intelligence: DNSBL listings, IPsum score, FireHOL lists, bad ASN flag, Tor exit status. Comprehensive threat assessment for an IP address.

Get the name, organization, country, and description for an Autonomous System number. Lightweight version of as_whois.

Get all IPv4 and IPv6 network prefixes (netblocks) announced by an Autonomous System. Returns BGP-visible routes.

Get comprehensive domain reputation: Majestic rank, Tranco rank, HaGeZi blocklist status, Blackbook malware status, phishing database status, HSTS preload status, and disposable email detection.

Get domain popularity rankings from five independent sources: Majestic Million (backlinks), Tranco top 1M (aggregated traffic), Cloudflare Radar (1.1.1.1 DNS query popularity), Cisco Umbrella (OpenDNS query popularity), and Chrome UX Report (real Chrome user traffic).

Check a domain against HaGeZi DNS blocklists, Steven Black unified hosts, Blackbook malware list, phishing databases, Roskomnadzor (Russia), and Citizen Lab censorship lists. Returns which lists the domain appears on.

Resolve a domain through filtered public DNS resolvers and their unfiltered controls to detect provider threat-feed blocks.

Find other domains hosted on the same IP address(es) as the target domain. Resolves the domain's A records, then performs reverse IP lookups for each.

Find other domains using the same nameserver(s) as the target domain. Resolves the domain's NS records, then performs reverse NS lookups for each.

Find other domains using the same mail server(s) as the target domain. Resolves the domain's MX records, then performs reverse MX lookups for each.

Verify an email address by connecting to its mail server via SMTP. Checks MX records, tests if the address is accepted (RCPT TO), detects catch-all domains, and reports TLS support. Results are RAM-cached for 1 hour.

Check if the API is responding. Returns status and server timestamp.

Returns full transaction details: inputs with addresses and values, outputs with spent status, fee, size/weight, SegWit flag, and Lightning Network channel correlation. Supports both confirmed and mempool transactions.

Returns address balance, total received/sent, transaction counts, address type (P2PKH, P2SH, P2WPKH, P2TR), first/last seen block, and ransomware/abuse flags. Supports all Bitcoin address formats.

Returns block header (hash, timestamp, version, merkle root, difficulty, nonce), transaction count, and list of transaction IDs. Supports lookup by block height.

Returns a paginated list of transactions involving a Bitcoin address. Filter by direction: received (incoming funds), sent (outgoing funds), or all. Returns up to 100 transactions per call, sorted by block height descending (most recent first).

For a given transaction, returns which subsequent transactions consumed its outputs. Useful for UTXO tracking and chain analysis. Shows the spending txid for each output.

Returns cumulative blockchain metrics over a configurable block range. Available metrics include: txs, fees, segwittx, inputs, outputs, insats, outsats, btcusd, volusd, unspentoutputs, fullyspent, unspentsats, addresses, satoshiblocks, clnopen, clnclose, satlnopen, satlnclose, basereward, blockreward, batched, rbf, version2tx, lowestfee, and more. Returns sampled data points suitable for charting.