IPinfo Alternative: Free IP Geolocation and ASN Lookup

Each lookup merges three sources: the local MaxMind GeoLite2 City and ASN databases for location and network owner, ip-api.com for ISP, reverse DNS and proxy detection, and IPinfo itself as an enrichment and fallback source. When the sources disagree, GeoLite2 wins for location and the API sources fill the network fields.

• Location: country, region, city, postal code, coordinates, time zone.
• Network: ASN, AS name, ISP, organisation, reverse DNS hostname.
• Risk flags: datacenter (hosting) ASN, proxy or VPN when detected.
• Context: which privacy law applies in the IP's country (GDPR, CCPA and similar).

You can pass a hostname instead of an IP; it is resolved first, and private or reserved addresses are refused. For the network side alone, the ASN lookup and reverse IP lookup go deeper.

The same lookup is available as a keyless endpoint that returns plain text, JSON or CSV:

curl "https://enterno.io/api/open/ip?q=8.8.8.8&format=json"

For scripts that need a stable quota, REST API v4 exposes /api/v4/ip with an API key. The free plan includes 200 API calls a day; paid plans raise that limit (see pricing). Keyless calls share the per-minute rate limit of the website tool, so they suit ad-hoc scripts, not bulk enrichment.

• Scale and SLA. IPinfo publishes 99.99% uptime and plans from 150k to 5M requests a month, with per-request overage billing. Enterno has no SLA for the IP endpoint.
• Depth of data. Paid IPinfo tiers add an accuracy radius, mobile carrier, residential proxy detection with service names, company data, IP WHOIS, IP ranges and abuse contacts. Enterno does not offer these fields.
• Own dataset. IPinfo produces its own data and offers database downloads, including a free country-level Lite database with attribution. Enterno relies on third-party data.
• Integrations. IPinfo Enterprise ships data into Snowflake, Google Cloud and Splunk.

• You want city-level data and a proxy flag for a handful of IPs and do not want to sign up. IPinfo's free Lite plan is country-level only.
• You are debugging a server rather than enriching traffic: the IP lookup sits next to DNS lookup, WHOIS and SSL checks, and the same API key covers all of them.
• You need a quick shell one-liner with no token management.

Geolocation of any provider is an estimate. Country-level answers are usually right; city-level answers for mobile and corporate networks are often the location of a gateway, not of the user.

If you are choosing a provider for production traffic, test both with a sample of your own visitor IPs and compare the answers with locations you already know, such as office networks or cloud regions you use. That tells you more than any published accuracy figure.