diff --git a/internal/dhcpd/db.go b/internal/dhcpd/db.go
index c6a7b8ab..453470a1 100644
--- a/internal/dhcpd/db.go
+++ b/internal/dhcpd/db.go
@@ -71,16 +71,17 @@ func (s *server) dbLoad() (err error) {
 			IP:       ip,
 			Hostname: obj[i].Hostname,
 			Expiry:   time.Unix(obj[i].Expiry, 0),
+			IsStatic: obj[i].Expiry == leaseExpireStatic,
 		}
 
 		if len(obj[i].IP) == 16 {
-			if obj[i].Expiry == leaseExpireStatic {
+			if lease.IsStatic {
 				v6StaticLeases = append(v6StaticLeases, &lease)
 			} else {
 				v6DynLeases = append(v6DynLeases, &lease)
 			}
 		} else {
-			if obj[i].Expiry == leaseExpireStatic {
+			if lease.IsStatic {
 				staticLeases = append(staticLeases, &lease)
 			} else {
 				dynLeases = append(dynLeases, &lease)
diff --git a/internal/dhcpd/dhcpd.go b/internal/dhcpd/dhcpd.go
index 07a73a48..6ac830d6 100644
--- a/internal/dhcpd/dhcpd.go
+++ b/internal/dhcpd/dhcpd.go
@@ -51,6 +51,9 @@ type Lease struct {
 	//
 	// TODO(a.garipov): Migrate leases.db.
 	IP netip.Addr `json:"ip"`
+
+	// IsStatic defines if the lease is static.
+	IsStatic bool `json:"static"`
 }
 
 // Clone returns a deep copy of l.
@@ -64,6 +67,7 @@ func (l *Lease) Clone() (clone *Lease) {
 		Hostname: l.Hostname,
 		HWAddr:   slices.Clone(l.HWAddr),
 		IP:       l.IP,
+		IsStatic: l.IsStatic,
 	}
 }
 
@@ -84,17 +88,10 @@ func (l *Lease) IsBlocklisted() (ok bool) {
 	return true
 }
 
-// IsStatic returns true if the lease is static.
-//
-// TODO(a.garipov): Just make it a boolean field.
-func (l *Lease) IsStatic() (ok bool) {
-	return l != nil && l.Expiry.Unix() == leaseExpireStatic
-}
-
 // MarshalJSON implements the json.Marshaler interface for Lease.
 func (l Lease) MarshalJSON() ([]byte, error) {
 	var expiryStr string
-	if !l.IsStatic() {
+	if !l.IsStatic {
 		// The front-end is waiting for RFC 3999 format of the time
 		// value.  It also shouldn't got an Expiry field for static
 		// leases.
diff --git a/internal/dhcpd/dhcpd_unix_test.go b/internal/dhcpd/dhcpd_unix_test.go
index 9e52f62a..40e83697 100644
--- a/internal/dhcpd/dhcpd_unix_test.go
+++ b/internal/dhcpd/dhcpd_unix_test.go
@@ -80,7 +80,7 @@ func TestDB(t *testing.T) {
 
 	assert.Equal(t, leases[1].HWAddr, ll[0].HWAddr)
 	assert.Equal(t, leases[1].IP, ll[0].IP)
-	assert.True(t, ll[0].IsStatic())
+	assert.True(t, ll[0].IsStatic)
 
 	assert.Equal(t, leases[0].HWAddr, ll[1].HWAddr)
 	assert.Equal(t, leases[0].IP, ll[1].IP)
diff --git a/internal/dhcpd/http_unix_test.go b/internal/dhcpd/http_unix_test.go
index 0204a7e6..187f9638 100644
--- a/internal/dhcpd/http_unix_test.go
+++ b/internal/dhcpd/http_unix_test.go
@@ -27,6 +27,7 @@ func TestServer_handleDHCPStatus(t *testing.T) {
 		Hostname: staticName,
 		HWAddr:   staticMAC,
 		IP:       staticIP,
+		IsStatic: true,
 	}
 
 	s, err := Create(&ServerConfig{
diff --git a/internal/dhcpd/v4_unix.go b/internal/dhcpd/v4_unix.go
index 25c25bad..fd8ee586 100644
--- a/internal/dhcpd/v4_unix.go
+++ b/internal/dhcpd/v4_unix.go
@@ -128,7 +128,7 @@ func (s *v4Server) ResetLeases(leases []*Lease) (err error) {
 	s.leases = nil
 
 	for _, l := range leases {
-		if !l.IsStatic() {
+		if !l.IsStatic {
 			l.Hostname = s.validHostnameForClient(l.Hostname, l.IP)
 		}
 		err = s.addLease(l)
@@ -190,7 +190,7 @@ func (s *v4Server) GetLeases(flags GetLeasesFlags) (leases []*Lease) {
 			continue
 		}
 
-		if getStatic && l.IsStatic() {
+		if getStatic && l.IsStatic {
 			leases = append(leases, l.Clone())
 		}
 	}
@@ -211,7 +211,7 @@ func (s *v4Server) FindMACbyIP(ip netip.Addr) (mac net.HardwareAddr) {
 
 	for _, l := range s.leases {
 		if l.IP == ip {
-			if l.Expiry.After(now) || l.IsStatic() {
+			if l.Expiry.After(now) || l.IsStatic {
 				return l.HWAddr
 			}
 		}
@@ -259,7 +259,7 @@ func (s *v4Server) rmLeaseByIndex(i int) {
 // Return error if a static lease is found
 func (s *v4Server) rmDynamicLease(lease *Lease) (err error) {
 	for i, l := range s.leases {
-		isStatic := l.IsStatic()
+		isStatic := l.IsStatic
 
 		if bytes.Equal(l.HWAddr, lease.HWAddr) || l.IP == lease.IP {
 			if isStatic {
@@ -292,7 +292,7 @@ func (s *v4Server) addLease(l *Lease) (err error) {
 	leaseIP := net.IP(l.IP.AsSlice())
 	offset, inOffset := r.offset(leaseIP)
 
-	if l.IsStatic() {
+	if l.IsStatic {
 		// TODO(a.garipov, d.seregin): Subnet can be nil when dhcp server is
 		// disabled.
 		if sn := s.conf.subnet; !sn.Contains(l.IP) {
@@ -359,6 +359,7 @@ func (s *v4Server) AddStaticLease(l *Lease) (err error) {
 	}
 
 	l.Expiry = time.Unix(leaseExpireStatic, 0)
+	l.IsStatic = true
 
 	err = netutil.ValidateMAC(l.HWAddr)
 	if err != nil {
@@ -528,7 +529,7 @@ func (s *v4Server) nextIP() (ip net.IP) {
 func (s *v4Server) findExpiredLease() int {
 	now := time.Now()
 	for i, lease := range s.leases {
-		if !lease.IsStatic() && lease.Expiry.Before(now) {
+		if !lease.IsStatic && lease.Expiry.Before(now) {
 			return i
 		}
 	}
@@ -860,7 +861,7 @@ func (s *v4Server) handleRequest(req, resp *dhcpv4.DHCPv4) (lease *Lease, needsR
 	s.leasesLock.Lock()
 	defer s.leasesLock.Unlock()
 
-	if lease.IsStatic() {
+	if lease.IsStatic {
 		if lease.Hostname != "" {
 			// TODO(e.burkov):  This option is used to update the server's DNS
 			// mapping.  The option should only be answered when it has been
diff --git a/internal/dhcpd/v4_unix_test.go b/internal/dhcpd/v4_unix_test.go
index 7fdc76b3..7ce3cdc3 100644
--- a/internal/dhcpd/v4_unix_test.go
+++ b/internal/dhcpd/v4_unix_test.go
@@ -73,6 +73,7 @@ func TestV4Server_leasing(t *testing.T) {
 			Hostname: staticName,
 			HWAddr:   staticMAC,
 			IP:       staticIP,
+			IsStatic: true,
 		})
 		require.NoError(t, err)
 
@@ -82,6 +83,7 @@ func TestV4Server_leasing(t *testing.T) {
 				Hostname: staticName,
 				HWAddr:   anotherMAC,
 				IP:       anotherIP,
+				IsStatic: true,
 			})
 			assert.ErrorIs(t, err, ErrDupHostname)
 		})
@@ -96,6 +98,7 @@ func TestV4Server_leasing(t *testing.T) {
 				Hostname: anotherName,
 				HWAddr:   staticMAC,
 				IP:       anotherIP,
+				IsStatic: true,
 			})
 			testutil.AssertErrorMsg(t, wantErrMsg, err)
 		})
@@ -110,6 +113,7 @@ func TestV4Server_leasing(t *testing.T) {
 				Hostname: anotherName,
 				HWAddr:   anotherMAC,
 				IP:       staticIP,
+				IsStatic: true,
 			})
 			testutil.AssertErrorMsg(t, wantErrMsg, err)
 		})
@@ -326,7 +330,7 @@ func TestV4_AddReplace(t *testing.T) {
 	for i, l := range ls {
 		assert.Equal(t, stLeases[i].IP, l.IP)
 		assert.Equal(t, stLeases[i].HWAddr, l.HWAddr)
-		assert.True(t, l.IsStatic())
+		assert.True(t, l.IsStatic)
 	}
 }
 
@@ -890,6 +894,7 @@ func TestV4Server_FindMACbyIP(t *testing.T) {
 			Hostname: staticName,
 			HWAddr:   staticMAC,
 			IP:       staticIP,
+			IsStatic: true,
 		}, {
 			Expiry:   time.Unix(10, 0),
 			Hostname: anotherName,
diff --git a/internal/dhcpd/v6_unix.go b/internal/dhcpd/v6_unix.go
index 177abfb3..b0499413 100644
--- a/internal/dhcpd/v6_unix.go
+++ b/internal/dhcpd/v6_unix.go
@@ -121,7 +121,7 @@ func (s *v6Server) FindMACbyIP(ip netip.Addr) (mac net.HardwareAddr) {
 
 	for _, l := range s.leases {
 		if l.IP == ip {
-			if l.Expiry.After(now) || l.IsStatic() {
+			if l.Expiry.After(now) || l.IsStatic {
 				return l.HWAddr
 			}
 		}
diff --git a/internal/dhcpd/v6_unix_test.go b/internal/dhcpd/v6_unix_test.go
index 7a588054..85c29e3e 100644
--- a/internal/dhcpd/v6_unix_test.go
+++ b/internal/dhcpd/v6_unix_test.go
@@ -331,6 +331,7 @@ func TestV6_FindMACbyIP(t *testing.T) {
 			Hostname: staticName,
 			HWAddr:   staticMAC,
 			IP:       staticIP,
+			IsStatic: true,
 		}, {
 			Expiry:   time.Unix(10, 0),
 			Hostname: anotherName,
@@ -344,6 +345,7 @@ func TestV6_FindMACbyIP(t *testing.T) {
 		Hostname: staticName,
 		HWAddr:   staticMAC,
 		IP:       staticIP,
+		IsStatic: true,
 	}, {
 		Expiry:   time.Unix(10, 0),
 		Hostname: anotherName,