diff --git a/CHANGELOG.md b/CHANGELOG.md
index e75e46e..18225ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,11 @@ Operators, you should copy/paste content of this content straight to your projec
 
 If you were at `firehose-core` version `1.0.0` and are bumping to `1.1.0`, you should copy the content between those 2 version to your own repository, replacing placeholder value `fire{chain}` with your chain's own binary.
 
+## Unreleased
+
+* `firehose-grpc-listen-addr` flag now accepts comma-separated addresses (allows listening as plaintext and snakeoil-ssl at the same time or on specific ip addresses)
+* removed old `RegisterServiceExtension` implementation (not used anywhere anymore)
+
 ## v1.6.6
 
 * Bump `substreams` and `dmetering` to latest version adding the `outputModuleHash` to metering sender.
diff --git a/firehose/app/firehose/app.go b/firehose/app/firehose/app.go
index 7474a78..20dae47 100644
--- a/firehose/app/firehose/app.go
+++ b/firehose/app/firehose/app.go
@@ -26,7 +26,6 @@ import (
 	pbbstream "github.com/streamingfast/bstream/pb/sf/bstream/v1"
 	"github.com/streamingfast/bstream/transform"
 	"github.com/streamingfast/dauth"
-	dgrpcserver "github.com/streamingfast/dgrpc/server"
 	"github.com/streamingfast/dmetrics"
 	"github.com/streamingfast/dstore"
 	firecore "github.com/streamingfast/firehose-core"
@@ -51,21 +50,14 @@ type Config struct {
 	ServerOptions           []server.Option `json:"-"`
 }
 
-type RegisterServiceExtensionFunc func(server dgrpcserver.Server,
-	mergedBlocksStore dstore.Store,
-	forkedBlocksStore dstore.Store, // this can be nil here
-	forkableHub *hub.ForkableHub,
-	logger *zap.Logger)
-
 type Modules struct {
 	// Required dependencies
-	Authenticator            dauth.Authenticator
-	HeadTimeDriftMetric      *dmetrics.HeadTimeDrift
-	HeadBlockNumberMetric    *dmetrics.HeadBlockNum
-	TransformRegistry        *transform.Registry
-	RegisterServiceExtension RegisterServiceExtensionFunc
-	CheckPendingShutdown     func() bool
-	InfoServer               *info.InfoServer
+	Authenticator         dauth.Authenticator
+	HeadTimeDriftMetric   *dmetrics.HeadTimeDrift
+	HeadBlockNumberMetric *dmetrics.HeadBlockNum
+	TransformRegistry     *transform.Registry
+	CheckPendingShutdown  func() bool
+	InfoServer            *info.InfoServer
 }
 
 type App struct {
@@ -169,15 +161,6 @@ func (a *App) Run() error {
 	})
 	firehoseServer.OnTerminated(a.Shutdown)
 
-	if a.modules.RegisterServiceExtension != nil {
-		a.modules.RegisterServiceExtension(
-			firehoseServer.Server,
-			mergedBlocksStore,
-			forkedBlocksStore,
-			forkableHub,
-			a.logger)
-	}
-
 	go func() {
 		if withLive {
 			a.logger.Info("waiting until hub is real-time synced")
diff --git a/firehose/server/server.go b/firehose/server/server.go
index 66acb03..22a3291 100644
--- a/firehose/server/server.go
+++ b/firehose/server/server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"net/url"
 	"strings"
+	"sync"
 	"time"
 
 	_ "github.com/mostynb/go-grpc-compression/zstd"
@@ -13,7 +14,6 @@ import (
 	dgrpcserver "github.com/streamingfast/dgrpc/server"
 	"github.com/streamingfast/dgrpc/server/factory"
 	"github.com/streamingfast/dmetering"
-	"github.com/streamingfast/dmetrics"
 	firecore "github.com/streamingfast/firehose-core"
 	"github.com/streamingfast/firehose-core/firehose"
 	"github.com/streamingfast/firehose-core/firehose/info"
@@ -37,15 +37,17 @@ type Server struct {
 	initFunc     func(context.Context, *pbfirehoseV2.Request) context.Context
 	postHookFunc func(context.Context, *pbfirehoseV2.Response)
 
-	dgrpcserver.Server
-	listenAddr       string
-	healthListenAddr string
-	logger           *zap.Logger
-	metrics          dmetrics.Set
+	servers []*wrappedServer
+	logger  *zap.Logger
 
 	rateLimiter rate.Limiter
 }
 
+type wrappedServer struct {
+	dgrpcserver.Server
+	listenAddr string
+}
+
 type Option func(*Server)
 
 func WithLeakyBucketLimiter(size int, dripRate time.Duration) Option {
@@ -83,48 +85,60 @@ func New(
 	}
 
 	tracerProvider := otel.GetTracerProvider()
-	options := []dgrpcserver.Option{
-		dgrpcserver.WithLogger(logger),
-		dgrpcserver.WithHealthCheck(dgrpcserver.HealthCheckOverGRPC|dgrpcserver.HealthCheckOverHTTP, createHealthCheck(isReady)),
-		dgrpcserver.WithPostUnaryInterceptor(otelgrpc.UnaryServerInterceptor(otelgrpc.WithTracerProvider(tracerProvider))),
-		dgrpcserver.WithPostStreamInterceptor(otelgrpc.StreamServerInterceptor(otelgrpc.WithTracerProvider(tracerProvider))),
-		dgrpcserver.WithGRPCServerOptions(grpc.MaxRecvMsgSize(25 * 1024 * 1024)),
-		dgrpcserver.WithPostUnaryInterceptor(dauthgrpc.UnaryAuthChecker(authenticator, logger)),
-		dgrpcserver.WithPostStreamInterceptor(dauthgrpc.StreamAuthChecker(authenticator, logger)),
-	}
 
-	if serviceDiscoveryURL != nil {
-		options = append(options, dgrpcserver.WithServiceDiscoveryURL(serviceDiscoveryURL))
-	}
+	var servers []*wrappedServer
+	for _, addr := range strings.Split(listenAddr, ",") {
+		options := []dgrpcserver.Option{
+			dgrpcserver.WithLogger(logger),
+			dgrpcserver.WithHealthCheck(dgrpcserver.HealthCheckOverGRPC|dgrpcserver.HealthCheckOverHTTP, createHealthCheck(isReady)),
+			dgrpcserver.WithPostUnaryInterceptor(otelgrpc.UnaryServerInterceptor(otelgrpc.WithTracerProvider(tracerProvider))),
+			dgrpcserver.WithPostStreamInterceptor(otelgrpc.StreamServerInterceptor(otelgrpc.WithTracerProvider(tracerProvider))),
+			dgrpcserver.WithGRPCServerOptions(grpc.MaxRecvMsgSize(25 * 1024 * 1024)),
+			dgrpcserver.WithPostUnaryInterceptor(dauthgrpc.UnaryAuthChecker(authenticator, logger)),
+			dgrpcserver.WithPostStreamInterceptor(dauthgrpc.StreamAuthChecker(authenticator, logger)),
+		}
 
-	if strings.Contains(listenAddr, "*") {
-		options = append(options, dgrpcserver.WithInsecureServer())
-	} else {
-		options = append(options, dgrpcserver.WithPlainTextServer())
-	}
+		if serviceDiscoveryURL != nil {
+			options = append(options, dgrpcserver.WithServiceDiscoveryURL(serviceDiscoveryURL))
+		}
+
+		if strings.Contains(addr, "*") {
+			options = append(options, dgrpcserver.WithInsecureServer())
+			addr = strings.ReplaceAll(addr, "*", "")
+		} else {
+			options = append(options, dgrpcserver.WithPlainTextServer())
+		}
+
+		srv := factory.ServerFromOptions(options...)
 
-	grpcServer := factory.ServerFromOptions(options...)
+		servers = append(servers, &wrappedServer{
+			Server:     srv,
+			listenAddr: addr,
+		})
+
+	}
 
 	s := &Server{
-		Server:            grpcServer,
+		servers:           servers,
 		transformRegistry: transformRegistry,
 		blockGetter:       blockGetter,
 		streamFactory:     streamFactory,
-		listenAddr:        strings.ReplaceAll(listenAddr, "*", ""),
 		initFunc:          initFunc,
 		postHookFunc:      postHookFunc,
 		logger:            logger,
 	}
 
 	logger.Info("registering grpc services")
-	grpcServer.RegisterService(func(gs grpc.ServiceRegistrar) {
-		if blockGetter != nil {
-			pbfirehoseV2.RegisterFetchServer(gs, s)
-		}
-		pbfirehoseV2.RegisterEndpointInfoServer(gs, infoServer)
-		pbfirehoseV2.RegisterStreamServer(gs, s)
-		pbfirehoseV1.RegisterStreamServer(gs, NewFirehoseProxyV1ToV2(s)) // compatibility with firehose
-	})
+	for _, srv := range servers {
+		srv.RegisterService(func(gs grpc.ServiceRegistrar) {
+			if blockGetter != nil {
+				pbfirehoseV2.RegisterFetchServer(gs, s)
+			}
+			pbfirehoseV2.RegisterEndpointInfoServer(gs, infoServer)
+			pbfirehoseV2.RegisterStreamServer(gs, s)
+			pbfirehoseV1.RegisterStreamServer(gs, NewFirehoseProxyV1ToV2(s)) // compatibility with firehose
+		})
+	}
 
 	for _, opt := range opts {
 		opt(s)
@@ -133,8 +147,28 @@ func New(
 	return s
 }
 
+func (s *Server) OnTerminated(f func(error)) {
+	for _, server := range s.servers {
+		server.OnTerminated(f)
+	}
+}
+
+func (s *Server) Shutdown(timeout time.Duration) {
+	for _, server := range s.servers {
+		server.Shutdown(timeout)
+	}
+}
+
 func (s *Server) Launch() {
-	s.Server.Launch(s.listenAddr)
+	wg := sync.WaitGroup{}
+	for _, server := range s.servers {
+		wg.Add(1)
+		go func() {
+			server.Launch(server.listenAddr)
+			wg.Done()
+		}()
+	}
+	wg.Wait()
 }
 
 func createHealthCheck(isReady func(ctx context.Context) bool) dgrpcserver.HealthCheck {