diff --git a/internal/config/app_domain.go b/internal/config/app_domain.go
index 19eeb7f..7c47e21 100644
--- a/internal/config/app_domain.go
+++ b/internal/config/app_domain.go
@@ -1,6 +1,6 @@
 package config
 
 type AppDomainConfig struct {
-	Domain string `json:"domain" pageship:"required,max=200,hostname_port,lowercase"`
+	Domain string `json:"domain" pageship:"required,max=200,hostname_rfc1123,lowercase"`
 	Site   string `json:"site" pageship:"required,dnsLabel"`
 }
diff --git a/internal/handler/site/handler.go b/internal/handler/site/handler.go
index dfc8794..693cef6 100644
--- a/internal/handler/site/handler.go
+++ b/internal/handler/site/handler.go
@@ -48,7 +48,7 @@ func NewHandler(ctx context.Context, logger *zap.Logger, domainResolver domain.R
 		middlewares:    conf.Middlewares,
 	}
 
-	cache, err := cache.NewCache(cacheSize, cacheTTL, h.doResolve)
+	cache, err := cache.NewCache(cacheSize, cacheTTL, h.doResolveHandler)
 	if err != nil {
 		return nil, fmt.Errorf("setup cache: %w", err)
 	}
@@ -57,13 +57,17 @@ func NewHandler(ctx context.Context, logger *zap.Logger, domainResolver domain.R
 	return h, nil
 }
 
-func (h *Handler) resolveSite(hostname string) (*SiteHandler, error) {
-	return h.cache.Load(hostname)
+func (h *Handler) resolveHandler(host string) (*SiteHandler, error) {
+	return h.cache.Load(host)
 }
 
-func (h *Handler) doResolve(hostname string) (*SiteHandler, error) {
-	matchedID, ok := h.hostPattern.MatchString(hostname)
+func (h *Handler) ResolveSite(host string) (*site.Descriptor, error) {
+	matchedID, ok := h.hostPattern.MatchString(host)
 	if !ok {
+		hostname, _, err := net.SplitHostPort(host)
+		if err != nil {
+			hostname = host
+		}
 		id, err := h.domainResolver.Resolve(h.ctx, hostname)
 		if errors.Is(err, domain.ErrDomainNotFound) {
 			return nil, site.ErrSiteNotFound
@@ -78,6 +82,15 @@ func (h *Handler) doResolve(hostname string) (*SiteHandler, error) {
 		return nil, err
 	}
 
+	return desc, nil
+}
+
+func (h *Handler) doResolveHandler(host string) (*SiteHandler, error) {
+	desc, err := h.ResolveSite(host)
+	if err != nil {
+		return nil, err
+	}
+
 	return NewSiteHandler(desc, h.middlewares), nil
 }
 
@@ -89,7 +102,7 @@ func (h *Handler) CheckValidDomain(hostname string) error {
 	if h.siteResolver.IsWildcard() {
 		return nil
 	}
-	_, err := h.resolveSite(hostname)
+	_, err := h.ResolveSite(hostname)
 	return err
 }
 
@@ -112,7 +125,7 @@ func (h *Handler) checkAuthz(r *http.Request, handler *SiteHandler) error {
 }
 
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	handler, err := h.resolveSite(r.Host)
+	handler, err := h.resolveHandler(r.Host)
 	if errors.Is(err, site.ErrSiteNotFound) {
 		http.NotFound(w, r)
 		return
diff --git a/internal/handler/site/handler_test.go b/internal/handler/site/handler_test.go
new file mode 100644
index 0000000..d3a0603
--- /dev/null
+++ b/internal/handler/site/handler_test.go
@@ -0,0 +1,86 @@
+package site_test
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/oursky/pageship/internal/domain"
+	sitehandler "github.com/oursky/pageship/internal/handler/site"
+	"github.com/oursky/pageship/internal/site"
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap"
+)
+
+type mockDomainResolver struct {
+	domains map[string]string
+}
+
+func (*mockDomainResolver) Kind() string { return "mock" }
+
+func (r *mockDomainResolver) Resolve(ctx context.Context, hostname string) (string, error) {
+	if id, ok := r.domains[hostname]; ok {
+		return id, nil
+	}
+	return "", domain.ErrDomainNotFound
+}
+
+type mockSiteResolver struct {
+	wildcard bool
+	sites    map[string]string
+}
+
+func (r *mockSiteResolver) IsWildcard() bool { return r.wildcard }
+
+func (*mockSiteResolver) Kind() string { return "mock" }
+
+func (r *mockSiteResolver) Resolve(ctx context.Context, matchedID string) (*site.Descriptor, error) {
+	if id, ok := r.sites[matchedID]; ok {
+		return &site.Descriptor{ID: id}, nil
+	}
+	return nil, site.ErrSiteNotFound
+}
+
+func TestHandleResolution(t *testing.T) {
+	hostPattern := "http://*.pageship.local"
+	domainResolver := &mockDomainResolver{
+		domains: map[string]string{
+			"example.com":     "example",
+			"dev.example.com": "dev.example",
+		},
+	}
+	siteResolver := &mockSiteResolver{
+		sites: map[string]string{
+			"example":     "example/main",
+			"dev.example": "example/dev",
+			"test":        "test/main",
+			"dev.test":    "test/dev",
+		},
+	}
+
+	handler, err := sitehandler.NewHandler(context.Background(), zap.NewNop(),
+		domainResolver, siteResolver, sitehandler.HandlerConfig{HostPattern: hostPattern})
+	assert.NoError(t, err)
+
+	resolve := func(host string) any {
+		desc, err := handler.ResolveSite(host)
+		if errors.Is(err, site.ErrSiteNotFound) {
+			return nil
+		} else if err != nil {
+			panic(err)
+		}
+		return desc
+	}
+
+	assert.Equal(t, resolve("example.com"), &site.Descriptor{ID: "example/main"})
+	assert.Equal(t, resolve("example.com:8001"), &site.Descriptor{ID: "example/main"})
+	assert.Equal(t, resolve("dev.example.com"), &site.Descriptor{ID: "example/dev"})
+	assert.Equal(t, resolve("example.local"), nil)
+
+	assert.Equal(t, resolve("test.pageship.local"), &site.Descriptor{ID: "test/main"})
+	assert.Equal(t, resolve("dev.test.pageship.local"), &site.Descriptor{ID: "test/dev"})
+	assert.Equal(t, resolve("dev.test.pageship.local:8001"), &site.Descriptor{ID: "test/dev"})
+	assert.Equal(t, resolve("staging.test.pageship.local"), nil)
+	assert.Equal(t, resolve("pageship.local"), nil)
+	assert.Equal(t, resolve("main.pageship.local"), nil)
+}