diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..67b5c5d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+watch:
+	modd
+	
+test:
+	go test -v -race ./...
\ No newline at end of file
diff --git a/arp/error.go b/arp/error.go
new file mode 100644
index 0000000..eb6f613
--- /dev/null
+++ b/arp/error.go
@@ -0,0 +1,8 @@
+package arp
+
+import "errors"
+
+var (
+	ErrNotFound      = errors.New("not found")
+	ErrIfaceNotFound = errors.New("iface not found")
+)
diff --git a/arp/identifier.go b/arp/identifier.go
new file mode 100644
index 0000000..f7efffe
--- /dev/null
+++ b/arp/identifier.go
@@ -0,0 +1,42 @@
+package arp
+
+import (
+	"context"
+	"net/http"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+type Identifier struct {
+	arp *Table
+}
+
+func (i *Identifier) Watch(ctx context.Context, config WatchConfig) error {
+	return i.arp.Watch(ctx, config)
+}
+
+func (i *Identifier) Identify(r *http.Request) (string, error) {
+	ip := strings.SplitN(r.RemoteAddr, ":", 2)[0]
+
+	mac, err := i.arp.FindMACByIP(ip)
+	if err != nil {
+		if errors.Is(err, ErrNotFound) {
+			return "", nil
+		}
+
+		return "", errors.WithStack(err)
+	}
+
+	return mac, nil
+}
+
+func (i *Identifier) OnOffline(fn func(id string)) {
+	i.arp.OnOffline(fn)
+}
+
+func NewIdentifier() *Identifier {
+	return &Identifier{
+		arp: NewTable(),
+	}
+}
diff --git a/arp/table.go b/arp/table.go
new file mode 100644
index 0000000..4395fd2
--- /dev/null
+++ b/arp/table.go
@@ -0,0 +1,153 @@
+package arp
+
+import (
+	"context"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/irai/arp"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+type Table struct {
+	mutex     sync.RWMutex
+	onOffline func(id string)
+	entries   map[string]string
+}
+
+type WatchConfig struct {
+	RouterIP        string
+	RouterNetwork   string
+	HostIP          string
+	NIC             string
+	OfflineDeadline time.Duration
+	ProbeInterval   time.Duration
+	PurgeDeadline   time.Duration
+}
+
+func (t *Table) Watch(ctx context.Context, config WatchConfig) error {
+	ipRouter := net.ParseIP(config.RouterIP).To4()
+	ipHost := net.ParseIP(config.HostIP).To4()
+
+	_, lanNetwork, err := net.ParseCIDR(config.RouterNetwork)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	hostMac, err := t.getMACAddress(config.NIC)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	h, err := arp.New(arp.Config{
+		HostMAC:         hostMac,
+		HostIP:          ipHost,
+		HomeLAN:         *lanNetwork,
+		NIC:             config.NIC,
+		RouterIP:        ipRouter,
+		OfflineDeadline: config.OfflineDeadline,
+		ProbeInterval:   config.ProbeInterval,
+		PurgeDeadline:   config.PurgeDeadline,
+	})
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	go func() {
+		if err := h.ListenAndServe(ctx); err != nil {
+			panic(errors.WithStack(err))
+		}
+	}()
+
+	notifications := make(chan arp.MACEntry)
+	h.AddNotificationChannel(notifications)
+
+	go t.handleNotifications(ctx, notifications)
+
+	return nil
+}
+
+func (t *Table) FindMACByIP(ip string) (string, error) {
+	t.mutex.RLock()
+	defer t.mutex.RUnlock()
+
+	mac, exists := t.entries[ip]
+	if !exists {
+		return "", errors.WithStack(ErrNotFound)
+	}
+
+	return mac, nil
+}
+
+func (t *Table) Count() int {
+	t.mutex.RLock()
+	defer t.mutex.RUnlock()
+
+	return len(t.entries)
+}
+
+func (t *Table) handleNotifications(ctx context.Context, notifications chan arp.MACEntry) {
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case entry := <-notifications:
+			logger.Debug(ctx, "arp notification", logger.F("entry", entry))
+
+			ip := entry.IP().String()
+
+			if entry.Online {
+				t.add(ip, entry.MAC.String())
+			} else {
+				t.delete(ip)
+			}
+		}
+	}
+}
+
+func (t *Table) add(ip string, mac string) {
+	t.mutex.Lock()
+	defer t.mutex.Unlock()
+
+	t.entries[ip] = mac
+}
+
+func (t *Table) delete(ip string) {
+	t.mutex.Lock()
+	defer t.mutex.Unlock()
+
+	mac, exists := t.entries[ip]
+
+	delete(t.entries, ip)
+
+	if exists && t.onOffline != nil {
+		t.onOffline(mac)
+	}
+}
+
+func (t *Table) getMACAddress(nic string) (net.HardwareAddr, error) {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	for _, iface := range ifaces {
+		if iface.Name == nic {
+			return iface.HardwareAddr, nil
+		}
+	}
+
+	return nil, errors.WithStack(ErrIfaceNotFound)
+}
+
+func (t *Table) OnOffline(fn func(id string)) {
+	t.onOffline = fn
+}
+
+func NewTable() *Table {
+	return &Table{
+		entries: make(map[string]string),
+	}
+}
diff --git a/go.mod b/go.mod
index 7f0c366..0a9873f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,8 @@ module forge.cadoles.com/wpetit/go-captiveportal
 
 go 1.15
 
-require github.com/pkg/errors v0.9.1
+require (
+	github.com/irai/arp v1.3.1
+	github.com/pkg/errors v0.9.1
+	gitlab.com/wpetit/goweb v0.0.0-20200707070104-985ce3eba3c2
+)
diff --git a/go.sum b/go.sum
index 7c401c3..72c7df0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,259 @@
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+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
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+google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
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+google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
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+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
diff --git a/identifier.go b/identifier.go
index 16ce9cf..1818070 100644
--- a/identifier.go
+++ b/identifier.go
@@ -1,17 +1,10 @@
 package captiveportal
 
-import "net/http"
+import (
+	"net/http"
+)
 
 type Identifier interface {
 	Identify(r *http.Request) (string, error)
-}
-
-type IdentifierFunc func(r *http.Request) (string, error)
-
-func (f IdentifierFunc) Identify(r *http.Request) (string, error) {
-	return f(r)
-}
-
-func DefaultIdentifier(r *http.Request) (string, error) {
-	return "", nil
+	OnOffline(func(id string))
 }
diff --git a/matcher.go b/matcher.go
index 90b2aea..44ffdb4 100644
--- a/matcher.go
+++ b/matcher.go
@@ -39,7 +39,7 @@ func MatchAndroid(r *http.Request) (bool, error) {
 	// http://g.cn
 	matches := strings.Contains(r.URL.Path, "generate_204") ||
 		strings.Contains(r.URL.Path, "gen_204") ||
-		r.URL.Hostname() == "g.cn"
+		strings.Contains(r.Host, "g.cn")
 
 	return matches, nil
 }
@@ -49,10 +49,8 @@ func MatchApple(r *http.Request) (bool, error) {
 	//
 	// http://www.apple.com/library/test/success.html
 	// http://captive.apple.com/hotspot-detect.html
-	hostname := r.URL.Hostname()
-
-	matches := hostname == "www.apple.com" ||
-		hostname == "captive.apple.com"
+	matches := strings.Contains(r.Host, "www.apple.com") ||
+		strings.Contains(r.Host, "captive.apple.com")
 
 	return matches, nil
 }
@@ -62,10 +60,8 @@ func MatchLinux(r *http.Request) (bool, error) {
 	//
 	// http://start.ubuntu.com/connectivity-check.html
 	// http://nmcheck.gnome.org/check_network_status.txt
-	hostname := r.URL.Hostname()
-
-	matches := hostname == "start.ubuntu.com" ||
-		hostname == "nmcheck.gnome.org"
+	matches := strings.Contains(r.Host, "start.ubuntu.com") ||
+		strings.Contains(r.Host, "nmcheck.gnome.org")
 
 	return matches, nil
 }
@@ -75,9 +71,7 @@ func MatchWindows(r *http.Request) (bool, error) {
 	//
 	// http://www.msftncsi.com
 	// http://www.msftncsi.com/ncsi.txt
-	hostname := r.URL.Hostname()
-
-	matches := hostname == "www.msftncsi.com"
+	matches := strings.Contains(r.Host, "www.msftncsi.com")
 
 	return matches, nil
 }
diff --git a/middleware.go b/middleware.go
index 6dfab48..447fea7 100644
--- a/middleware.go
+++ b/middleware.go
@@ -4,6 +4,7 @@ import (
 	"net/http"
 
 	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
 )
 
 func (s *Service) Middleware() func(next http.Handler) http.Handler {
@@ -13,33 +14,61 @@ func (s *Service) Middleware() func(next http.Handler) http.Handler {
 
 	return func(next http.Handler) http.Handler {
 		fn := func(w http.ResponseWriter, r *http.Request) {
+			ctx := r.Context()
+
 			matches, os, err := matcher.Match(r)
 			if err != nil {
 				panic(errors.WithStack(err))
 			}
 
+			logger.Debug(
+				ctx, "applied captive portal matching",
+				logger.F("os", os),
+				logger.F("url", r.URL.String()),
+				logger.F("host", r.Host),
+				logger.F("matches", matches),
+			)
+
 			if !matches {
 				next.ServeHTTP(w, r)
 
 				return
 			}
 
-			id, err := s.options.Identifier.Identify(r)
+			id, err := s.identifier.Identify(r)
 			if err != nil {
 				panic(errors.Wrap(err, ErrClientIdentificationFailed.Error()))
 			}
 
+			logger.Debug(
+				ctx, "identified captive portal client",
+				logger.F("remoteAddr", r.RemoteAddr),
+				logger.F("id", id),
+			)
+
 			registry.Touch(id, os)
 
 			if registry.IsLying(id) {
+				logger.Debug(
+					ctx, "lying to captive portal client",
+					logger.F("remoteAddr", r.RemoteAddr),
+					logger.F("id", id),
+				)
+
 				liar.Handle(os, w, r)
 
 				return
 			}
 
 			if registry.IsCaptive(id) {
+				logger.Debug(
+					ctx, "capture captive portal client",
+					logger.F("remoteAddr", r.RemoteAddr),
+					logger.F("id", id),
+				)
+
 				// Redirect to configured URL
-				http.Redirect(w, r, s.captivePortalURL, http.StatusTemporaryRedirect)
+				http.Redirect(w, r, s.redirectURL, http.StatusTemporaryRedirect)
 
 				return
 			}
diff --git a/modd.conf b/modd.conf
new file mode 100644
index 0000000..2dd42df
--- /dev/null
+++ b/modd.conf
@@ -0,0 +1,3 @@
+**/*.go {
+  prep: make test
+}
\ No newline at end of file
diff --git a/option.go b/option.go
index 67e9842..59d3c07 100644
--- a/option.go
+++ b/option.go
@@ -1,17 +1,15 @@
 package captiveportal
 
 type Options struct {
-	Identifier Identifier
-	Matcher    Matcher
-	Liar       Liar
+	Matcher Matcher
+	Liar    Liar
 }
 
 type OptionsFunc func(*Options)
 
 func DefaultOptions() *Options {
 	return &Options{
-		Identifier: IdentifierFunc(DefaultIdentifier),
-		Matcher:    MatchFunc(DefaultMatch),
-		Liar:       LiarFunc(DefaultLiar),
+		Matcher: MatchFunc(DefaultMatch),
+		Liar:    LiarFunc(DefaultLiar),
 	}
 }
diff --git a/provider.go b/provider.go
new file mode 100644
index 0000000..fea3e6f
--- /dev/null
+++ b/provider.go
@@ -0,0 +1,42 @@
+package captiveportal
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const (
+	ServiceName service.Name = "captiveportal"
+)
+
+func ServiceProvider(redirectURL string, identifier Identifier, opts ...OptionsFunc) service.Provider {
+	srv := New(redirectURL, identifier, opts...)
+	return func(ctn *service.Container) (interface{}, error) {
+		return srv, nil
+	}
+}
+
+// From retrieves the service in the given container
+func From(container *service.Container) (*Service, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*Service)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the service in the given container or panic otherwise
+func Must(container *service.Container) *Service {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}
diff --git a/registry.go b/registry.go
index 3e4af3e..642f0cd 100644
--- a/registry.go
+++ b/registry.go
@@ -2,14 +2,13 @@ package captiveportal
 
 import (
 	"sync"
-	"time"
 )
 
 type Client struct {
-	LastSeen time.Time
-	Captive  bool
-	Lying    bool
-	OS       OS
+	ID      string
+	Captive bool
+	Lying   bool
+	OS      OS
 }
 
 type Registry struct {
@@ -22,7 +21,6 @@ func (r *Registry) Touch(id string, os OS) {
 	defer r.mutex.Unlock()
 
 	client := r.upsert(id)
-	client.LastSeen = time.Now()
 	client.OS = os
 }
 
@@ -75,13 +73,33 @@ func (r *Registry) IsLying(id string) bool {
 		return false
 	}
 
-	return client.Captive
+	return client.Lying
+}
+
+func (r *Registry) Delete(id string) {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	delete(r.clients, id)
+}
+
+func (r *Registry) Clients() []Client {
+	r.mutex.RLock()
+	defer r.mutex.RUnlock()
+
+	clients := make([]Client, 0, len(r.clients))
+	for _, c := range r.clients {
+		clients = append(clients, *c)
+	}
+
+	return clients
 }
 
 func (r *Registry) upsert(id string) *Client {
 	client, exists := r.clients[id]
 	if !exists {
 		client = &Client{
+			ID:      id,
 			Captive: true,
 			Lying:   false,
 			OS:      OSUnknown,
diff --git a/service.go b/service.go
index 67d9e98..5df3ff4 100644
--- a/service.go
+++ b/service.go
@@ -7,13 +7,14 @@ import (
 )
 
 type Service struct {
-	captivePortalURL string
-	options          *Options
-	registry         *Registry
+	redirectURL string
+	identifier  Identifier
+	options     *Options
+	registry    *Registry
 }
 
 func (s *Service) ClientID(r *http.Request) (string, error) {
-	id, err := s.options.Identifier.Identify(r)
+	id, err := s.identifier.Identify(r)
 	if err != nil {
 		return "", errors.Wrap(err, ErrClientIdentificationFailed.Error())
 	}
@@ -27,6 +28,10 @@ func (s *Service) IsCaptive(r *http.Request) (bool, error) {
 		return false, errors.WithStack(err)
 	}
 
+	if id == "" {
+		return true, nil
+	}
+
 	return s.registry.IsCaptive(id), nil
 }
 
@@ -36,6 +41,10 @@ func (s *Service) Release(r *http.Request) error {
 		return errors.WithStack(err)
 	}
 
+	if id == "" {
+		return nil
+	}
+
 	s.registry.Release(id)
 
 	return nil
@@ -47,6 +56,10 @@ func (s *Service) Lie(r *http.Request) error {
 		return errors.WithStack(err)
 	}
 
+	if id == "" {
+		return nil
+	}
+
 	s.registry.Lie(id)
 
 	return nil
@@ -58,19 +71,30 @@ func (s *Service) ClientOS(r *http.Request) (OS, error) {
 		return OSUnknown, errors.WithStack(err)
 	}
 
+	if id == "" {
+		return OSUnknown, nil
+	}
+
 	return s.registry.ClientOS(id), nil
 }
 
-func New(captivePortalURL string, opts ...OptionsFunc) *Service {
+func New(redirectURL string, identifier Identifier, opts ...OptionsFunc) *Service {
 	options := DefaultOptions()
 
 	for _, o := range opts {
 		o(options)
 	}
 
-	return &Service{
-		captivePortalURL: captivePortalURL,
-		options:          options,
-		registry:         NewRegistry(),
+	service := &Service{
+		identifier:  identifier,
+		redirectURL: redirectURL,
+		options:     options,
+		registry:    NewRegistry(),
 	}
+
+	identifier.OnOffline(func(id string) {
+		service.registry.Delete(id)
+	})
+
+	return service
 }