diff --git a/package.json b/package.json
index 0261e95..8758165 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
-    "lint": "vue-cli-service lint"
+    "lint": "vue-cli-service lint",
+    "test:ip-patterns": "node --test tests/ip-patterns.test.cjs"
   },
   "dependencies": {
     "axios": "^1.4.0",
diff --git a/src/components/Packet.vue b/src/components/Packet.vue
index ce5b4a0..efcbbd3 100644
--- a/src/components/Packet.vue
+++ b/src/components/Packet.vue
@@ -7,6 +7,11 @@
 			<button @click.prevent="copyText" class="btn btn-link">Copy text</button>
 			<button @click.prevent="copyPythonBytes" class="btn btn-link">Copy as Python bytes</button>
 		</div>
+		<div v-if="packet.sourceIp || packet.destinationIp" class="packet-addresses">
+			<span title="Source IP" :style="ipHighlightStyle('SOURCE_IP')">{{ packet.sourceIp || '?' }}</span>
+			&rarr;
+			<span title="Destination IP" :style="ipHighlightStyle('DESTINATION_IP')">{{ packet.destinationIp || '?' }}</span>
+		</div>
 		<p v-if="!this.$store.state.hexdumpMode"
 			 class="pt-2 pb-2 mb-3"
 			 v-html="stringdata"/>
@@ -25,6 +30,8 @@
 				id: Number(),
 				matches: Array(),
 				timestamp: Number(),
+				sourceIp: String(),
+				destinationIp: String(),
 				incoming: Boolean(),
 				ungzipped: Boolean(),
 				webSocketParsed: Boolean(),
@@ -50,6 +57,13 @@
 			},
 		},
 		methods: {
+			ipHighlightStyle(target) {
+				const match = (this.packet.matches || []).find(match => match.searchTarget === target &&
+					this.$store.state.patterns.some(pattern => pattern.id === match.patternId && !pattern.deleted));
+				if (!match) return {};
+				const pattern = this.$store.state.patterns.find(pattern => pattern.id === match.patternId);
+				return {backgroundColor: pattern.color,};
+			},
 			atou(b64) {
 				const text = atob(b64);
 				const length = text.length;
@@ -127,6 +141,7 @@
 				}, {}); // Array to object
 				let offset = 0;
 				this.packet.matches
+					.filter(match => !match.searchTarget || match.searchTarget === 'CONTENT')
 					.filter(match => !patterns[match.patternId].deleted)
 					.sort((a, b) => a.startPosition - b.startPosition)
 					.forEach(match => {
@@ -179,6 +194,11 @@
 </script>
 
 <style scoped>
+	.packet-addresses {
+		font-family: "Ubuntu Mono", "Lucida Console", monospace;
+		overflow-wrap: anywhere;
+	}
+
 	.packet-outgoing {
 		background: var(--response-packet-color);
 		box-shadow: 0 0 5px 5px var(--response-packet-color);
diff --git a/src/components/PatternsDropdown.vue b/src/components/PatternsDropdown.vue
index df4dcb6..148cc1e 100644
--- a/src/components/PatternsDropdown.vue
+++ b/src/components/PatternsDropdown.vue
@@ -18,6 +18,7 @@
 			<s v-else :style="`color: ${pattern.color};`">{{ pattern.name }}</s>:
 
 			<code>{{ getSearchTypeValue(pattern.searchType, pattern.value) }}</code>;
+			<span v-if="pattern.searchTarget && pattern.searchTarget !== 'CONTENT'">{{ getSearchTargetLabel(pattern.searchTarget) }}; </span>
 
       <template v-if="pattern.actionType === 'FIND'">search </template>
       <template v-else>ignore </template>
@@ -89,6 +90,9 @@
 			},
 		},
 		methods: {
+			getSearchTargetLabel(target) {
+				return {SOURCE_IP: 'source IP', DESTINATION_IP: 'destination IP', EITHER_IP: 'either IP address',}[target];
+			},
 			getSearchTypeValue(searchType, value) {
 				if (searchType === 'REGEX') return `/${value}/`;
 				else if (searchType === 'SUBSTRING') return `'${value}'`;
diff --git a/src/components/Sidebar.vue b/src/components/Sidebar.vue
index dfda1a0..9eb4338 100644
--- a/src/components/Sidebar.vue
+++ b/src/components/Sidebar.vue
@@ -203,7 +203,7 @@ export default {
 				const currentPort = parseInt(this.$route?.params?.servicePort, 10);
 				if (currentPort && currentPort !== stream.service) return;
 				if (this.$store.state.displayFavoritesOnly || this.$store.state.pause) return;
-				if (this.$route.query.pattern && !stream.foundPatterns.some(e => e.id === this.$route.query.pattern)) {
+				if (this.$route.query.pattern && !(stream.foundPatternsIds || []).includes(Number(this.$route.query.pattern))) {
 					return;
 				}
 
diff --git a/src/views/PatternModal.vue b/src/views/PatternModal.vue
index 1aef427..0a78567 100644
--- a/src/views/PatternModal.vue
+++ b/src/views/PatternModal.vue
@@ -8,7 +8,7 @@
 					label-cols-sm="4"
 					label-cols-lg="3"
 					label="Name"
-					description="It is displayed in the list and highlighted in the packet contents"
+					description="It is displayed in the list and highlights matching content or IP addresses"
 					label-for="pattern-name">
 				<b-form-input @keydown.native.enter="addPattern" id="pattern-name" required v-model="newPattern.name"/>
 			</b-form-group>
@@ -47,6 +47,21 @@
 				<b-form-input id="pattern-color" required type="color" v-model="newPattern.color"/>
 			</b-form-group>
 
+			<b-form-group
+					v-if="creating"
+					label-cols-sm="4"
+					label-cols-lg="3"
+					label="Search in"
+					description="IP addresses use regular expressions. Use ^ and $ to match the entire address."
+					label-for="pattern-searchTarget">
+				<b-form-select id="pattern-searchTarget" required v-model="newPattern.searchTarget" @change="onSearchTargetChange">
+					<option value="CONTENT">Packet content</option>
+					<option value="SOURCE_IP">Source IP</option>
+					<option value="DESTINATION_IP">Destination IP</option>
+					<option value="EITHER_IP">Either IP address</option>
+				</b-form-select>
+			</b-form-group>
+
 			<b-form-group
 					v-if="creating"
 					label-cols-sm="4"
@@ -54,7 +69,7 @@
 					label="Search method"
 					description="The way to search for patterns in packets"
 					label-for="pattern-searchType">
-				<b-form-select id="pattern-searchType" required v-model="newPattern.searchType">
+				<b-form-select id="pattern-searchType" required v-model="newPattern.searchType" :disabled="newPattern.searchTarget !== 'CONTENT'">
 					<option value="REGEX" selected>Regular expression</option>
 					<option value="SUBSTRING">Substring</option>
 					<option value="SUBBYTES">Bytes</option>
@@ -97,6 +112,7 @@ const defaultPattern = {
 	value: '',
 	color: '#FF7474',
 	searchType: 'SUBSTRING',
+	searchTarget: 'CONTENT',
 	directionType: 'BOTH',
 	actionType: 'FIND',
 	serviceId: null,
@@ -112,6 +128,7 @@ const defaultPattern = {
 				value: String,
 				color: String,
 				searchType: String,
+				searchTarget: String,
 				directionType: String,
 				actionType: String,
 				serviceId: Number,
@@ -145,7 +162,11 @@ const defaultPattern = {
 			},
 		},
 		methods: {
+			onSearchTargetChange(target) {
+				if (target !== 'CONTENT') this.newPattern.searchType = 'REGEX';
+			},
 			getPlaceholder() {
+				if (this.newPattern.searchTarget && this.newPattern.searchTarget !== 'CONTENT') return '^10\\.20\\.30\\.[0-9]+$';
 				if (this.newPattern.searchType === 'REGEX') return '[A-Z0-9]{31}=';
 				else if (this.newPattern.searchType === 'SUBSTRING') return 'HTTP/2';
 				else return 'DEAD BEEF 1337';
diff --git a/tests/ip-patterns.test.cjs b/tests/ip-patterns.test.cjs
new file mode 100644
index 0000000..61a1db3
--- /dev/null
+++ b/tests/ip-patterns.test.cjs
@@ -0,0 +1,79 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const vm = require('node:vm');
+const test = require('node:test');
+const compiler = require('vue-template-compiler');
+
+// Exercise the actual component methods without a browser or an extra test framework.
+function component(relativePath) {
+    const file = fs.readFileSync(path.join(__dirname, '../src', relativePath), 'utf8');
+    const source = compiler.parseComponent(file).script.content
+        .replace(/^\s*import .*$/gm, '')
+        .replace('export default', 'module.exports =');
+    const sandbox = {module: {exports: {}}, SidebarStream: {}, PatternModal: {}, LookBack: {}, console};
+    vm.runInNewContext(source, sandbox);
+    return sandbox.module.exports;
+}
+
+test('IP selection uses regex and provides an escaped IPv4 example', () => {
+    const methods = component('views/PatternModal.vue').methods;
+    const context = {newPattern: {searchTarget: 'SOURCE_IP', searchType: 'SUBBYTES'}};
+    methods.onSearchTargetChange.call(context, 'SOURCE_IP');
+    assert.equal(context.newPattern.searchType, 'REGEX');
+    assert.equal(methods.getPlaceholder.call(context), '^10\\.20\\.30\\.[0-9]+$');
+});
+
+test('live filter accepts matching DTO IDs and rejects other streams', () => {
+    const addStream = component('components/Sidebar.vue').methods.addStreamFromWs;
+    const context = {
+        $route: {params: {servicePort: '80'}, query: {pattern: '7'}},
+        $store: {state: {displayFavoritesOnly: false, pause: false}},
+        streams: [],
+    };
+    addStream.call(context, {id: 1, service: 80, foundPatternsIds: [7]});
+    addStream.call(context, {id: 2, service: 80, foundPatternsIds: [8]});
+    addStream.call(context, {id: 3, service: 443, foundPatternsIds: [7]});
+    addStream.call(context, {id: 4, service: 80});
+    assert.deepEqual(context.streams.map(stream => stream.id), [1]);
+});
+
+test('IP matches highlight endpoints without changing payload highlights', () => {
+    const methods = component('components/Packet.vue').methods;
+    const context = {
+        $store: {state: {patterns: [
+            {id: 1, color: '#112233', deleted: false},
+            {id: 2, color: '#445566', deleted: false},
+        ]}},
+        packet: {matches: [
+            {patternId: 1, searchTarget: 'SOURCE_IP', startPosition: 0, endPosition: 10},
+            {patternId: 2, searchTarget: 'CONTENT', startPosition: 0, endPosition: 3},
+        ]},
+    };
+    assert.equal(methods.ipHighlightStyle.call(context, 'SOURCE_IP').backgroundColor, '#112233');
+    assert.equal(Object.keys(methods.ipHighlightStyle.call(context, 'DESTINATION_IP')).length, 0);
+    assert.equal(methods.highlightPatterns.call(context, 'FLAG rest'),
+        '<span style="background-color: #445566">FLAG</span> rest');
+
+    context.packet.matches = [context.packet.matches[0]];
+    assert.equal(methods.highlightPatterns.call(context, 'unchanged'), 'unchanged');
+    context.$store.state.patterns[0].deleted = true;
+    assert.equal(Object.keys(methods.ipHighlightStyle.call(context, 'SOURCE_IP')).length, 0);
+});
+
+test('legacy content matches without a target retain their highlights', () => {
+    const methods = component('components/Packet.vue').methods;
+    const context = {
+        $store: {state: {patterns: [{id: 1, color: '#112233', deleted: false}]}},
+        packet: {matches: [{patternId: 1, startPosition: 0, endPosition: 3}]},
+    };
+    assert.equal(methods.highlightPatterns.call(context, 'FLAG'),
+        '<span style="background-color: #112233">FLAG</span>');
+});
+
+test('pattern list identifies the selected IP field', () => {
+    const method = component('components/PatternsDropdown.vue').methods.getSearchTargetLabel;
+    assert.equal(method('SOURCE_IP'), 'source IP');
+    assert.equal(method('DESTINATION_IP'), 'destination IP');
+    assert.equal(method('EITHER_IP'), 'either IP address');
+});