Debugging traffic spikes
Spike in 502s from one ASN? Paste an IP from your access log, see the ASN, decide whether to rate-limit or block it.
Free IP lookup — geolocation, ASN, ISP.
Paste an IPv4 or IPv6 address and get the country, region, city, postal code, coordinates, timezone, ASN, organisation, ISP, and hostname — instantly, no signup, no key.
Quick Answer
Codersera's free GeoIP lookup tool returns a richly detailed location (country, region, city, postal code, coordinates, timezone, continent), the network operator (ASN, organisation, ISP, hostname), and metadata (flag emoji, region code, source provider) for any IPv4 or IPv6 address. No signup, no key, no daily limit, 60 lookups per minute per IP. Use the form, paste an IP, or hit "Lookup my IP" to get your own location. There's also a developer-friendly JSON endpoint at /api/tools/ip-lookup so AI agents and scripts can use it directly.
What it returns
Every field you usually want, in one card
Some legacy tools return just country + city. Ours surfaces the full network-operator picture too, because that's what you actually need for debugging, abuse handling, and analytics work.
country / countryCode
Full country name plus the ISO 3166-1 alpha-2 code (US, DE, IN, etc.).
state / regionCode
Administrative region or US state. Some countries do not expose this for all IP blocks.
city
The city the IP geolocates to. Accuracy varies — see the Accuracy section below.
postal
Postal / ZIP code where available.
latitude / longitude
Decimal degrees. We surface the Google Maps link for one-click visualisation.
timezone
IANA timezone name (America/Los_Angeles, Europe/Berlin, etc.) — use directly with Intl APIs.
asn / org / isp
Autonomous System Number plus the operator and ISP names. Critical for security work and abuse handling.
hostname
Reverse-DNS hostname if present (dns.google, etc.). Confirms who runs the IP.
continent
High-level region grouping when you need to filter by EMEA / APAC / Americas / etc.
flagEmoji
The country flag as a Unicode emoji — handy if you render the result in a UI.
API for AI agents + scripts
Drop the JSON endpoint straight into your agent
Public. CORS-enabled. No API key. Same data shape as the UI. Wire it into Claude Code, Codex, Cursor, or any script that can curl — it's designed for that.
GET /api/tools/ip-lookup?ip=8.8.8.8
curl https://codersera.com/api/tools/ip-lookup?ip=8.8.8.8
{
"success": true,
"data": {
"ip": "8.8.8.8",
"country": "United States",
"countryCode": "US",
"state": "California",
"city": "Mountain View",
"postal": "94039",
"latitude": 37.3861,
"longitude": -122.0839,
"timezone": "America/Los_Angeles",
"asn": 15169,
"org": "Google LLC",
"isp": "Google LLC",
"hostname": "google.com",
"flagEmoji": "🇺🇸",
"source": "ipwhois"
}
}POST /api/tools/ip-lookup (batch up to 10)
curl -X POST https://codersera.com/api/tools/ip-lookup \
-H 'content-type: application/json' \
-d '{"ips":["8.8.8.8","1.1.1.1","2001:4860:4860::8888"]}'GET /api/tools/ip-lookup (no params → your own IP)
curl https://codersera.com/api/tools/ip-lookup
Rate limit: 60 requests / minute per caller IP. CORS allows any origin. No auth headers, no API key. If both upstream providers fail, the endpoint returns the IP with all fields null and source: "unknown" so your script can retry or skip without parsing an error.
Use cases
What you can do with it
Abuse + security triage
Failed-login flood from a single /24? GeoIP-lookup five samples, identify the hosting provider, file an abuse report at their NOC contact.
Compliance + data residency
Verify a customer's IP geolocates to a region where you can legally serve them, or flag VPN/proxy hits for fraud review.
AI agent + script automation
Wire the JSON endpoint into Claude Code / Codex / Cursor: a task that reads /var/log/nginx/access.log can enrich each line with city + ASN with one extra fetch.
Analytics enrichment
Backfill historical request logs with city + timezone columns to power retention analytics broken out by region without burning your GA4 quota.
Game + voice latency hints
Quick sanity-check on whether a remote peer is on the same continent before deciding which relay server to route them through.
Accuracy + limitations
What GeoIP can and cannot tell you
Worth reading once if you're building anything that decides based on GeoIP. Misuse usually comes down to assuming GeoIP is more precise than it really is.
~99%
Country accuracy
Effectively a fact for non-VPN traffic. Suitable for legal-data-residency checks.
80–95%
Region / state
Reliable for the US, EU, India, etc. Less reliable for small countries with fewer assigned ranges.
50–80%
City (within ~50 km)
Treat as a hint, not a fact. Mobile carriers and VPN exit-IPs heavily skew the result.
~98%
ASN / organisation
Backed by registrar (ARIN/RIPE/APNIC) data, not estimation. Reliable for abuse-handling work.
FAQ
Frequently asked questions
Is it really free?
Yes — no signup, no API key, no daily cap. The server-side rate limit is 60 lookups per minute per caller IP, generous for both interactive use and modest automation.
How accurate is GeoIP?
Country accuracy is near-perfect (>99%). State/region accuracy is typically 80-95%. City accuracy is the noisy one — 50-80% within a 50-km radius, much worse for mobile carriers and VPN ranges. Treat the city as a hint, not a fact, for anything that matters.
Which database powers the data?
We proxy ipwho.is as the primary source and ipinfo.io as the fallback. Both consume MaxMind GeoLite2 + IP2Location LITE under the hood. The `source` field on the result tells you which provider answered.
Can my AI agent use this directly?
Yes — the JSON endpoint at /api/tools/ip-lookup is intentionally public, CORS-enabled, and documented in detail below. GET ?ip=<ip>, or POST { ips: [...] } for batches up to 10.
Does it work for IPv6?
Yes. Paste any full or compressed IPv6 address (2001:4860:4860::8888). The validator accepts every canonical form.
Will it deanonymise someone?
No. GeoIP is a coarse lookup against blocks-of-IPs registries; it does not connect IPs to people, accounts, or precise addresses. For a residential ISP IP it typically resolves to a city-level coordinate near the ISP's switching centre.
Do you log or store the IPs I look up?
We do not persist your lookups in any user-visible system. Application logs (PM2 / nginx) may contain the requests transiently for ops; nothing is sent to analytics or third parties beyond the underlying provider that resolved the IP.
How does this compare to running MaxMind locally?
Self-hosting MaxMind GeoLite2 is faster and gives you offline access, but you must update the database weekly and handle the MMDB binary format. For most teams, this proxy is the lower-friction choice and matches MaxMind data quality (because it is, ultimately, calling MaxMind data).
Can I look up multiple IPs at once?
Yes — POST { "ips": ["8.8.8.8", "1.1.1.1", "..."] } to /api/tools/ip-lookup. The endpoint caps each batch at 10 to keep upstream usage fair. For larger batches, paginate from your script.
What if a provider is down?
The endpoint tries ipwho.is first and falls back to ipinfo.io on any error. If both fail, it returns the IP with all fields null and source="unknown" rather than erroring — your script can retry or skip.
