diff --git a/internal/config/config.go b/internal/config/config.go
index c6366ea..de4024d 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -12,6 +12,7 @@ import (
 // Config of the program.
 type Config struct {
 	Cache
+	Geo
 	Logging
 	Server
 	Uplink
@@ -67,12 +68,21 @@ type Cache struct {
 	Size int `yaml:"size,omitempty"`
 }
 
+// Geo contains geolocation configuration.
+type Geo struct {
+	// IPCache contains the path to the IP Geodata cache.
+	IPCache string `yaml:"ipCache,omitempty"`
+}
+
 // Default contains the default configuration.
 func Default() *Config {
 	return &Config{
 		Cache{
 			Size: 12800,
 		},
+		Geo{
+			IPCache: "/wttr.in/cache/ip2l",
+		},
 		Logging{
 			AccessLog: "/wttr.in/log/access.log",
 			ErrorsLog: "/wttr.in/log/errors.log",
diff --git a/internal/processor/processor.go b/internal/processor/processor.go
index da829fa..6448d9a 100644
--- a/internal/processor/processor.go
+++ b/internal/processor/processor.go
@@ -15,6 +15,7 @@ import (
 	lru "github.com/hashicorp/golang-lru"
 
 	"github.com/chubin/wttr.in/internal/config"
+	geoip "github.com/chubin/wttr.in/internal/geo/ip"
 	"github.com/chubin/wttr.in/internal/routing"
 	"github.com/chubin/wttr.in/internal/stats"
 	"github.com/chubin/wttr.in/internal/util"
@@ -54,6 +55,7 @@ type RequestProcessor struct {
 	router            routing.Router
 	upstreamTransport *http.Transport
 	config            *config.Config
+	geoIPCache        *geoip.Cache
 }
 
 // NewRequestProcessor returns new RequestProcessor.
@@ -80,6 +82,7 @@ func NewRequestProcessor(config *config.Config) (*RequestProcessor, error) {
 		stats:             stats.New(),
 		upstreamTransport: transport,
 		config:            config,
+		geoIPCache:        geoip.NewCache(config),
 	}
 
 	// Initialize routes.
@@ -161,6 +164,13 @@ func (rp *RequestProcessor) ProcessRequest(r *http.Request) (*responseWithHeader
 			}
 		}
 
+		// How many IP addresses are known.
+		ip := util.ReadUserIP(r)
+		_, err = rp.geoIPCache.Read(ip)
+		if err == nil {
+			rp.stats.Inc("geoip")
+		}
+
 		rp.lruCache.Add(cacheDigest, responseWithHeader{InProgress: true})
 
 		response, err = get(r, rp.upstreamTransport)
diff --git a/internal/stats/stats.go b/internal/stats/stats.go
index a030add..220c0ec 100644
--- a/internal/stats/stats.go
+++ b/internal/stats/stats.go
@@ -75,6 +75,7 @@ func (c *Stats) Show() []byte {
 	fmt.Fprintf(&b, "%-20s: %d\n", "Upstream queries", c.v["total"]-c.v["cache1"])
 	fmt.Fprintf(&b, "%-20s: %d\n", "Queries with format", c.v["format"])
 	fmt.Fprintf(&b, "%-20s: %d\n", "Queries with format=j1", c.v["format=j1"])
+	fmt.Fprintf(&b, "%-20s: %d\n", "Queries with known IP", c.v["geoip"])
 
 	return b.Bytes()
 }