diff --git a/@overflow/model/discovery/Host.ts b/@overflow/model/discovery/Host.ts
index c0c9cbe..8808ae6 100644
--- a/@overflow/model/discovery/Host.ts
+++ b/@overflow/model/discovery/Host.ts
@@ -1,6 +1,6 @@
 import { Zone } from './Zone';
 // import { Port } from './Port';
-import { MetaIPType } from '../meta';
+import { MetaIPType, MetaDiscovererType } from '../meta';
 
 export const defaultOsType = 'UNKNOWN';
 export const defaultHostType = 'HOST';
@@ -20,7 +20,7 @@ export interface Host {
   hostModel?: string;
 
   meta?: Map<string, Map<string, string>>;
-  discoveredBy?: string[];
+  discoveredBy?: MetaDiscovererType[];
   discoveredDate?: Date;
 
   zone?: Zone;
diff --git a/@overflow/model/discovery/Port.ts b/@overflow/model/discovery/Port.ts
index 9a7588d..61fe112 100644
--- a/@overflow/model/discovery/Port.ts
+++ b/@overflow/model/discovery/Port.ts
@@ -1,12 +1,12 @@
 import { Host } from './Host';
-import { MetaPortType } from '../meta';
+import { MetaPortType, MetaDiscovererType } from '../meta';
 
 export interface Port {
   metaPortType?: MetaPortType;
   portNumber?: number;
 
   meta?: Map<string, Map<string, string>>;
-  discoveredBy?: string[];
+  discoveredBy?: MetaDiscovererType[];
   discoveredDate?: Date;
 
   host?: Host;
diff --git a/@overflow/model/discovery/Service.ts b/@overflow/model/discovery/Service.ts
index b4bc4ac..68d76db 100644
--- a/@overflow/model/discovery/Service.ts
+++ b/@overflow/model/discovery/Service.ts
@@ -1,5 +1,5 @@
 import { Port } from './Port';
-import { MetaCryptoType } from '../meta';
+import { MetaCryptoType, MetaDiscovererType } from '../meta';
 
 export const defaultServiceType = 'ETC';
 export const defaultServiceVendor = 'UNKNOWN';
@@ -16,7 +16,7 @@ export interface Service {
   serviceVersion?: string;
 
   meta?: Map<string, Map<string, string>>;
-  discoveredBy?: string[];
+  discoveredBy?: MetaDiscovererType[];
   discoveredDate?: Date;
 
   port?: Port;
diff --git a/@overflow/model/discovery/Zone.ts b/@overflow/model/discovery/Zone.ts
index 53ad0a5..c86dbd3 100644
--- a/@overflow/model/discovery/Zone.ts
+++ b/@overflow/model/discovery/Zone.ts
@@ -1,4 +1,4 @@
-import { MetaIPType } from '../meta';
+import { MetaIPType, MetaDiscovererType } from '../meta';
 
 export interface Zone {
   network?: string;
@@ -8,7 +8,7 @@ export interface Zone {
   mac?: string;
 
   meta?: Map<string, Map<string, string>>;
-  discoveredBy?: string[];
+  discoveredBy?: MetaDiscovererType[];
   discoveredDate?: Date;
 
   hostList?: any[];
diff --git a/@overflow/model/meta/MetaDiscovererType.ts b/@overflow/model/meta/MetaDiscovererType.ts
new file mode 100644
index 0000000..1b1e2ba
--- /dev/null
+++ b/@overflow/model/meta/MetaDiscovererType.ts
@@ -0,0 +1,35 @@
+export interface MetaDiscovererType {
+  id?: number;
+  name?: string;
+  key?: string;
+  createDate?: Date;
+}
+
+export enum MetaDiscovererTypeEnum {
+  UNKNOWN = 'UNKNOWN',
+  ARP = 'ARP',
+  ICMP = 'ICMP',
+  MDNS = 'MDNS',
+  NDP = 'NDP',
+  SNMP = 'SNMP',
+  TCPACK = 'TCPACK',
+  TCPFIN = 'TCPFIN',
+  TCPNULL = 'TCPNULL',
+  TCPXmas = 'TCPXmas',
+  TCPSyn = 'TCPSyn',
+  TCPConnection = 'TCPConnection',
+  TCPMatcher = 'TCPMatcher',
+  UDPConnection = 'UDPConnection',
+  UDPMatcher = 'UDPMatcher',
+  UPnP = 'UPnP',
+}
+
+export const toMetaDiscovererTypeEnum = (v: MetaDiscovererType): MetaDiscovererTypeEnum => {
+  return MetaDiscovererTypeEnum[v.key];
+};
+
+export const toMetaDiscovererType = (v: MetaDiscovererTypeEnum): MetaDiscovererType => {
+  return {
+    key: v,
+  };
+};
diff --git a/@overflow/model/meta/index.ts b/@overflow/model/meta/index.ts
index 8fe49dd..e7849b6 100644
--- a/@overflow/model/meta/index.ts
+++ b/@overflow/model/meta/index.ts
@@ -1,7 +1,9 @@
 export * from './MetaCrawler';
 export * from './MetaCrawlerInputItem';
 export * from './MetaCrawlerMapping';
+export * from './MetaCredentialType';
 export * from './MetaCryptoType';
+export * from './MetaDiscovererType';
 export * from './MetaEmailType';
 export * from './MetaHistoryType';
 export * from './MetaInfraType';