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/types/index.ts b/server/types/index.ts
index 48d2ac6..e8e9647 100644
--- a/server/types/index.ts
+++ b/server/types/index.ts
@@ -63,7 +63,17 @@ export function toNodeTokenResponse(node: StoredNode): NodeTokenResponse {
 
 export function toDomainSpecificNodeResponse(node: StoredNode, nodeStateData: NodeStateData): DomainSpecificNodeResponse {
     return {
-        ...toNodeResponse(node),
+        token: node.token,
+        nickname: node.nickname,
+        email: node.email,
+        hostname: node.hostname,
+        coords: node.coords,
+        key: node.key,
+        mac: node.mac,
+        monitoring: node.monitoringState !== MonitoringState.DISABLED,
+        monitoringConfirmed: node.monitoringState === MonitoringState.ACTIVE,
+        monitoringState: node.monitoringState,
+        modifiedAt: node.modifiedAt,
         site: nodeStateData.site,
         domain: nodeStateData.domain,
         onlineState: nodeStateData.state,
diff --git a/server/types/shared.ts b/server/types/shared.ts
index fee7a7f..4d367dc 100644
--- a/server/types/shared.ts
+++ b/server/types/shared.ts
@@ -93,6 +93,14 @@ export function isBoolean(arg: unknown): arg is boolean {
     return typeof arg === "boolean"
 }
 
+export function isUndefined(arg: unknown): arg is undefined {
+    return arg === undefined;
+}
+
+export function isNull(arg: unknown): arg is null {
+    return arg === null;
+}
+
 export function toIsArray<T>(isT: TypeGuard<T>): TypeGuard<T[]> {
     return (arg): arg is T[] => isArray(arg, isT);
 }
@@ -473,7 +481,7 @@ export const isDomain = isString;
 /**
  * Represents a node in the context of a Freifunk site and domain.
  */
-export type DomainSpecificNodeResponse = NodeResponse & {
+export type DomainSpecificNodeResponse = Record<NodeSortField, any> & NodeResponse & {
     site?: Site,
     domain?: Domain,
     onlineState?: OnlineState,
diff --git a/server/utils/resources.ts b/server/utils/resources.ts
index 6ad82c4..94722fc 100644
--- a/server/utils/resources.ts
+++ b/server/utils/resources.ts
@@ -9,7 +9,7 @@ import {
     EnumTypeGuard,
     EnumValue,
     type GenericSortField,
-    isJSONObject,
+    isJSONObject, isNumber, isString, isUndefined,
     JSONObject,
     SortDirection,
     TypeGuard
@@ -91,17 +91,14 @@ function filterCondition(restParams: RestParams, filterFields: string[]): Filter
         };
     }
 
-    let query = _.join(
-        _.map(filterFields, function (field) {
-            return 'LOWER(' + field + ') LIKE ?';
-        }),
-        ' OR '
-    );
+    let query = filterFields
+        .map(field => 'LOWER(' + field + ') LIKE ?')
+        .join(' OR ');
 
     query += ' ESCAPE \'\\\'';
 
-    const search = '%' + (_.isString(restParams.q) ? escapeForLikePattern(_.toLower(restParams.q.trim())) : '') + '%';
-    const params = _.times(filterFields.length, _.constant(search));
+    const search = '%' + (isString(restParams.q) ? escapeForLikePattern(restParams.q.trim().toLowerCase()) : '') + '%';
+    const params = _.times(filterFields.length, () => search);
 
     return {
         query: query,
@@ -111,13 +108,14 @@ function filterCondition(restParams: RestParams, filterFields: string[]): Filter
 
 function getConstrainedValues(data: { [key: string]: any }, constraints: Constraints): { [key: string]: any } {
     const values: { [key: string]: any } = {};
-    _.each(_.keys(constraints), (key: string): void => {
+    for (const key of Object.keys(constraints)) {
         const value = data[key];
         values[key] =
-            _.isUndefined(value) && key in constraints && !_.isUndefined(constraints[key].default)
+            isUndefined(value) && key in constraints && !isUndefined(constraints[key].default)
                 ? constraints[key].default
                 : value;
-    });
+
+    }
     return values;
 }
 
@@ -176,10 +174,10 @@ export async function getValidRestParams(
     return restParams as RestParams;
 }
 
-export function filter<E>(entities: ArrayLike<E>, allowedFilterFields: string[], restParams: RestParams): E[] {
+export function filter<E>(entities: E[], allowedFilterFields: string[], restParams: RestParams): E[] {
     let query = restParams.q;
     if (query) {
-        query = _.toLower(query.trim());
+        query = query.trim().toLowerCase();
     }
 
     function queryMatches(entity: Entity): boolean {
@@ -191,15 +189,15 @@ export function filter<E>(entities: ArrayLike<E>, allowedFilterFields: string[],
                 return true;
             }
             let value = entity[field];
-            if (_.isNumber(value)) {
+            if (isNumber(value)) {
                 value = value.toString();
             }
 
-            if (!_.isString(value) || _.isEmpty(value)) {
+            if (!isString(value) || _.isEmpty(value)) {
                 return false;
             }
 
-            value = _.toLower(value);
+            value = value.toLowerCase();
             if (field === 'mac') {
                 return _.includes(value.replace(/:/g, ''), query.replace(/:/g, ''));
             }
@@ -216,7 +214,7 @@ export function filter<E>(entities: ArrayLike<E>, allowedFilterFields: string[],
         }
 
         return _.every(filters, (value: any, key: string): boolean => {
-            if (_.isUndefined(value)) {
+            if (isUndefined(value)) {
                 return true;
             }
             if (_.startsWith(key, 'has')) {
@@ -232,25 +230,43 @@ export function filter<E>(entities: ArrayLike<E>, allowedFilterFields: string[],
     });
 }
 
-export function sort<T, S>(entities: ArrayLike<T>, isSortField: TypeGuard<S>, restParams: RestParams): ArrayLike<T> {
+export function sort<T extends Record<S, any>, S extends string>(entities: T[], isSortField: TypeGuard<S>, restParams: RestParams): T[] {
     const sortField: S | undefined = isSortField(restParams._sortField) ? restParams._sortField : undefined;
     if (!sortField) {
         return entities;
     }
 
-    const sorted: T[] = _.sortBy(entities, [sortField]);
-    if (restParams._sortDir === SortDirection.ASCENDING) {
-        return sorted;
-    } else {
-        return _.reverse(sorted);
-    }
+    const sorted = entities.slice(0);
+    sorted.sort((a, b) => {
+        let as = a[sortField];
+        let bs = b[sortField];
+
+        if (isString(as)) {
+            as = as.toLowerCase();
+        }
+        if (isString(bs)) {
+            bs = bs.toLowerCase();
+        }
+
+        let order = 0;
+        if (as < bs) {
+            order = -1;
+        }
+        else if (bs > as) {
+            order = 1;
+        }
+
+        return restParams._sortDir === SortDirection.DESCENDING ? -order : order;
+    });
+
+    return sorted;
 }
 
-export function getPageEntities(entities: ArrayLike<Entity>, restParams: RestParams) {
+export function getPageEntities(entities: Entity[], restParams: RestParams) {
     const page = restParams._page;
     const perPage = restParams._perPage;
 
-    return _.slice(entities, (page - 1) * perPage, page * perPage);
+    return entities.slice((page - 1) * perPage, page * perPage);
 }
 
 export {filterCondition as whereCondition};
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: {