One-stop shop for developer utilities. Converters, calculators, regex, QR codes, firewall generators, and more. Simple. Fast. Free tier included.
Binary, hex, base64, punycode. All the encoding conversions you need.
GET /api/v1/convert/hex2bin/FF
Scientific calculator, IPv4/IPv6 subnet calculator with full details.
GET /api/v1/calc/subnet/v4/10.0.0.0/8
Test and validate regex patterns. Get matches, groups, and positions.
POST /api/v1/regex/test
MD5, SHA1, SHA256, SHA512. Hash any content instantly.
GET /api/v1/hash/hello-world
Generate and convert rules: iptables, nftables, Cisco ACL, Juniper, AWS SG.
POST /api/v1/firewall/generate
Generate QR codes in PNG or SVG. Custom sizes and styles.
GET /api/v1/qr/generate?data=hello
No API key needed for basic requests. Just curl and go.
$ curl https://api.nerdapi.io/api/v1/calc/subnet/v4/192.168.1.0/24
{
"network": "192.168.1.0",
"broadcast": "192.168.1.255",
"netmask": "255.255.255.0",
"num_hosts": 254,
"first_host": "192.168.1.1",
"last_host": "192.168.1.254"
}Start free, scale when you need to.