NetworkCatsandClaude Opus 5.5
036a3fa061
The production image is built against musl, whose allocator is slow and takes a global lock. Profiling /json on a 1 CPU / 1 GB Alpine container showed malloc/free at ~11% of total CPU, the largest user-space cost; the rest is mostly the kernel network stack, already at one recvfrom and one writev per request. mimalloc alone, however, kept the freed ~96 MB MMDB buffer resident after a database update (RSS stayed at ~197 MB in two of three swaps), and MIMALLOC_PURGE_DELAY=0 fixes that only by giving back most of the speedup. So blocks of 1 MiB or more, in practice only the MMDB file contents, go to the system allocator, which unmaps them on free; RSS returns to ~98 MB after every swap, as before. Median of three alternating 20 s runs: /json across random IPs rose from 131.6k to 142.4k rps (+8%), p50 latency 0.465ms -> 0.443ms; a single IP rose from 124.5k to 127.4k rps (+2%). Steady-state RSS grows by ~12 MB. Responses are byte-identical to before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
RustyIP
Live demo: ip.nc.gy
What
RustyIP is a lightweight IP lookup service with both a web interface and an API. The frontend is minimal and works without JavaScript. The backend is written in Rust and handles high traffic reliably.
This is the only free IP lookup service with accurate proxy detection. We maintain our own exclusive proxy detection database, which is free and open source: https://github.com/NetworkCats/OpenProxyDB
We also improve geolocation coverage by merging multiple free geolocation databases into one. That's open source too: https://github.com/NetworkCats/Merged-IP-Data
RustyIP uses the best open source IP data available, delivers a clean user experience, and has zero ads or tracking.
Why
There are plenty of IP lookup sites and APIs out there, but most of them rely on the free GeoLite2 database and don't include any proxy information. On top of that, they're bloated with JavaScript and ads.
Since we already had OpenProxyDB, an accurate proxy detection database, it made sense to build a site where users can easily look up IP info. So we did.
We've privately benchmarked OpenProxyDB against commercial databases like IPinfo, and the accuracy holds up. It even outperforms them when it comes to detecting residential proxies. If you have an IPinfo or MaxMind API subscription, feel free to run your own tests.
How
You can use curl, HTTPie, wget, or any HTTP client. Here are some curl examples:
Get your current IP:
curl ip.nc.gy
Look up info about your own IP:
curl ip.nc.gy/asn
curl ip.nc.gy/org
curl ip.nc.gy/country
curl ip.nc.gy/city
curl ip.nc.gy/proxy
curl ip.nc.gy/vpn
curl ip.nc.gy/hosting
curl ip.nc.gy/tor
Or get everything as JSON:
curl ip.nc.gy/json
{
"ip": "203.0.113.42",
"city": {
"geoname_id": 5128581,
"names": {
"en": "New York"
}
},
"continent": {
"code": "NA",
"geoname_id": 6255149,
"names": {
"en": "North America"
}
},
"country": {
"geoname_id": 6252001,
"iso_code": "US",
"names": {
"en": "United States"
}
},
"location": {
"accuracy_radius": 1000,
"latitude": 40.7128,
"longitude": -74.006,
"metro_code": 501,
"time_zone": "America/New_York"
},
"postal": {
"code": "10001"
},
"subdivisions": [
{
"geoname_id": 5128638,
"iso_code": "NY",
"names": {
"en": "New York"
}
}
],
"asn": {
"autonomous_system_number": 13335,
"autonomous_system_organization": "Cloudflare, Inc.",
"as_domain": "cloudflare.com"
},
"proxy": {
"is_proxy": false,
"is_vpn": false,
"is_tor": false,
"is_hosting": false,
"is_cdn": false,
"is_school": false,
"is_anonymous": false
}
}
Look up a specific IP:
curl ip.nc.gy/json?ip=1.1.1.1
{
"ip": "1.1.1.1",
"continent": {
"code": "OC",
"geoname_id": 6255151,
"names": {
"en": "Oceania"
}
},
"country": {
"geoname_id": 2077456,
"iso_code": "AU",
"names": {
"en": "Australia"
}
},
"location": {
"accuracy_radius": 1000,
"latitude": -33.494,
"longitude": 143.2104,
"time_zone": "Australia/Sydney"
},
"asn": {
"autonomous_system_number": 13335,
"autonomous_system_organization": "Cloudflare, Inc.",
"as_domain": "cloudflare.com"
},
"proxy": {
"is_proxy": false,
"is_vpn": false,
"is_tor": false,
"is_hosting": false,
"is_cdn": true,
"is_school": false,
"is_anonymous": false
}
}
Use curl -4 or curl -6 to force IPv4 or IPv6.
See openapi.json in this repo for the full API spec.
Data Sources
Geolocation data is sourced from MaxMind and DB-IP free databases. AS data comes from IPinfo's free database. Proxy data comes from our own OpenProxyDB.
Attributions:
- Maxmind GeoLite2: Creative Commons Attribution-ShareAlike 4.0 International License
- IPinfo Lite: Creative Commons Attribution-ShareAlike 4.0 International License
- DB-IP: CC BY 4.0
- RouteViews ASN: CC0 1.0
- OpenProxyDB: CC0 1.0