IPv4 Address
IPv6 Address
IPv4 Host
IPv6 Host
X-Forwarded-For
(Your originating IP if with proxy)
User Agent Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Country United States
Country ISO US
ASN 16509
API
CommandResponse
curl -4 ip4.tw
curl -6 ip4.tw
curl -4 ip4.tw/host
curl -6 ip4.tw/host
curl ip4.tw/ua Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
curl ip4.tw/country United States
curl ip4.tw/country-iso US
curl ip4.tw/asn 16509
JSON Output API
Command Response
curl ip4.tw/json 
{
    "ip": "3.135.184.27",
    "host": "ec2-3-135-184-27.us-east-2.compute.amazonaws.com",
    "country": "United States",
    "country_iso": "US",
    "asn": 16509,
    "ua": "Mozilla\/5.0 AppleWebKit\/537.36 (KHTML, like Gecko; compatible; ClaudeBot\/1.0; +claudebot@anthropic.com)"
}