Connection
- IP address
- 216.73.216.142
- Reverse DNS
- no PTR record
- Network
- AS16509 Amazon.com, Inc.
- Prefix
- 216.73.216.0/22
- Country
- United States (US)
- Registry
- ARIN
Your public IPv4 address
216.73.216.142
AS16509 · Amazon.com, Inc. · United States (US)
IPv4 & IPv6
- IPv4
- 216.73.216.142
- IPv6
- checking…
Your browser connected via IPv4. The other address family is tested separately.
From the command line
$ curl tools.otw.solutions # your public IP
$ curl -4 tools.otw.solutions # force IPv4 (-6 for IPv6)
$ curl tools.otw.solutions/info # IP, reverse DNS, ASN, country
$ curl tools.otw.solutions/json # same as JSON
PS> irm tools.otw.solutions # PowerShellMore tools
- Domain lookupRegistrar, DNS hosting, web hosting, mail provider, SPF/DMARC/DKIM.
curl tools.otw.solutions/dns/example.com - DNS DiggerEvery DNS record of a domain that can be found, as a zone file — for moving to a new DNS provider.
curl tools.otw.solutions/dig/example.com - SSL/TLS checkCertificate, chain, expiry and TLS versions — HTTPS, SMTP/IMAP STARTTLS, LDAPS, any port.
curl tools.otw.solutions/ssl/example.com:443 - Port checkWhich ports of your own public IP are reachable from the internet?
curl tools.otw.solutions/ports/443,3389 - Blacklist checkIs an IP or a domain’s mail server listed on Spamhaus, SpamCop, Barracuda & co.?
curl tools.otw.solutions/blacklist/example.com - DNS propagationCompare a record across public resolvers and the authoritative nameservers.
curl tools.otw.solutions/propagation/example.com/MX - Microsoft 365 tenantTenant ID, name, region, managed/federated and the M365 DNS records of a domain.
curl tools.otw.solutions/m365/example.com - Subnet calculatorIPv4/IPv6 network, mask, host range — and splitting into smaller subnets.
curl tools.otw.solutions/subnet/10.0.0.0/22 - Regex testerTest ECMAScript (JavaScript) regular expressions live, with groups, replace preview and ready-made IT patterns.
runs in your browser - Cron explainerCron expression in plain English, next run times in any time zone, systemd OnCalendar equivalent.
curl tools.otw.solutions/cron/0_3_*_*_1-5 - Linux cheat sheetDebugging commands for AlmaLinux / RHEL — with Debian / Ubuntu equivalents.
curl tools.otw.solutions/linux/selinux - Docker cheat sheetContainers, logs, exec, disk space, networking, Compose and exit codes.
curl tools.otw.solutions/docker/logs - Password generatorRandom passwords and passphrases, generated in your browser.
curl tools.otw.solutions/pw