diff --git a/server/resources/nodeResource.ts b/server/resources/nodeResource.ts
index 190f820..92d9d14 100644
--- a/server/resources/nodeResource.ts
+++ b/server/resources/nodeResource.ts
@@ -32,7 +32,7 @@ function getNormalizedNodeData(reqData: any): CreateOrUpdateNode {
     _.each(nodeFields, function (field) {
         let value = normalizeString(reqData[field]);
         if (field === 'mac') {
-            value = normalizeMac(value);
+            value = normalizeMac(value as MAC);
         }
         node[field] = value;
     });
diff --git a/server/utils/strings.ts b/server/utils/strings.ts
index 78f126a..12ba84d 100644
--- a/server/utils/strings.ts
+++ b/server/utils/strings.ts
@@ -1,12 +1,13 @@
 import _ from "lodash"
+import {MAC} from "../types";
 
-export function normalizeString (str: string): string {
+export function normalizeString(str: string): string {
     return _.isString(str) ? str.trim().replace(/\s+/g, ' ') : str;
 }
 
-export function normalizeMac (mac: string): string {
+export function normalizeMac(mac: MAC): MAC {
     // parts only contains values at odd indexes
-    const parts = mac.toUpperCase().replace(/:/g, '').split(/([A-F0-9]{2})/);
+    const parts = mac.toUpperCase().replace(/[-:]/g, '').split(/([A-F0-9]{2})/);
 
     const macParts = [];
 
@@ -14,10 +15,10 @@ export function normalizeMac (mac: string): string {
         macParts.push(parts[i]);
     }
 
-    return macParts.join(':');
+    return macParts.join(':') as MAC;
 }
 
-export function parseInteger (str: string): number {
+export function parseInteger(str: string): number {
     const parsed = _.parseInt(str, 10);
     if (parsed.toString() === str) {
         return parsed;
diff --git a/server/validation/constraints.ts b/server/validation/constraints.ts
index 44f896a..587faf3 100644
--- a/server/validation/constraints.ts
+++ b/server/validation/constraints.ts
@@ -40,7 +40,7 @@ const CONSTRAINTS = {
         },
         coords: {
             type: 'string',
-            regex: /^(-?[0-9]{1,3}(\.[0-9]{1,15})? -?[0-9]{1,3}(\.[0-9]{1,15})?)$/,
+            regex: /^([a-f0-9]{12}|([a-f0-9]{2}:){5}[a-f0-9]{2}|([a-f0-9]{2}-){5}[a-f0-9]{2})$/i,
             optional: true
         },
         monitoring: {
diff --git a/shared/validation/constraints.js b/shared/validation/constraints.js
index 9c4d31f..dc6fbd7 100644
--- a/shared/validation/constraints.js
+++ b/shared/validation/constraints.js
@@ -38,7 +38,7 @@
             },
             mac: {
                 type: 'string',
-                regex: /^([a-f0-9]{12}|([a-f0-9]{2}:){5}[a-f0-9]{2})$/i,
+                regex: /^([a-f0-9]{12}|([a-f0-9]{2}:){5}[a-f0-9]{2}|([a-f0-9]{2}-){5}[a-f0-9]{2})$/i,
                 optional: false
             },
             coords: {