diff --git a/package-lock.json b/package-lock.json
index 52be32e..612b11a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "vue-cli-plugin-sitemap",
-  "version": "1.0.4",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/validation.js b/src/validation.js
index 64acfd0..21e61b2 100644
--- a/src/validation.js
+++ b/src/validation.js
@@ -196,13 +196,16 @@ const optionsValidator = ajv.compile({
 
 			anyOf: [
 				{
-					minLength:  0,
-					maxLength:  0,
+					minLength: 0,
+					maxLength: 0,
 				},
 				{
-					format:     'uri',
-					pattern:    '\\.[a-z]+$',
-				}
+					format:  'uri',
+					pattern: '\\.[a-z]+(?::\\d{1,4})?$',
+				},
+				{
+					pattern: '^https?:\\/\\/(?:\\d{1,3}\\.){3}\\d{1,3}(?::\\d{1,4})?$',
+				},
 			]
 		},
 		trailingSlash: {
diff --git a/test/sitemap.test.js b/test/sitemap.test.js
index 6a84390..b87c5ce 100644
--- a/test/sitemap.test.js
+++ b/test/sitemap.test.js
@@ -49,6 +49,20 @@ describe("single sitemap generation", () => {
 			})).to.deep.equal(wrapSitemap(
 				'<url><loc>https://website.net</loc></url><url><loc>https://website.net/about</loc></url>'
 			));
+
+			expect(await generate({
+				baseURL:   'https://website.net:7000',
+				urls:      ['/', '/about'],
+			})).to.deep.equal(wrapSitemap(
+				'<url><loc>https://website.net:7000</loc></url><url><loc>https://website.net:7000/about</loc></url>'
+			));
+
+			expect(await generate({
+				baseURL:   'https://162.75.90.1',
+				urls:      ['/', '/about'],
+			})).to.deep.equal(wrapSitemap(
+				'<url><loc>https://162.75.90.1</loc></url><url><loc>https://162.75.90.1/about</loc></url>'
+			));
 		});
 
 		it("removes trailing slashes", async () => {
diff --git a/test/validation.test.js b/test/validation.test.js
index 3706e89..74b8b17 100644
--- a/test/validation.test.js
+++ b/test/validation.test.js
@@ -35,13 +35,18 @@ describe("the validation of the options returns an error when:", () => {
 		expect(validate({ outputDir: './sitemap' })).to.be.true;
 	});
 
-	it("'baseURL' is not a proper URI", () => {
-		expect(validate({ baseURL: 'not an URI'                 })).to.be.false;
-		expect(validate({ baseURL: 'somedomain.wtf'             })).to.be.false;
-		expect(validate({ baseURL: 'https://missing-something'  })).to.be.false;
-
-		expect(validate({ baseURL: 'https://domain.fr'          })).to.be.true;
-		expect(validate({ baseURL: 'http://www.other-domain.fr' })).to.be.true;
+	it("'baseURL' is not a proper URI or IPv4 address", () => {
+		expect(validate({ baseURL: 'not an URI'                  })).to.be.false;
+		expect(validate({ baseURL: 'somedomain.wtf'              })).to.be.false;
+		expect(validate({ baseURL: 'https://missing-something'   })).to.be.false;
+		expect(validate({ baseURL: '127.0'                       })).to.be.false;
+
+		expect(validate({ baseURL: 'https://domain.fr'           })).to.be.true;
+		expect(validate({ baseURL: 'http://www.other-domain.fr'  })).to.be.true;
+		expect(validate({ baseURL: 'http://www.website.com:8080' })).to.be.true;
+		expect(validate({ baseURL: 'https://webapp.com:27'       })).to.be.true;
+		expect(validate({ baseURL: 'https://127.0.0.1'           })).to.be.true;
+		expect(validate({ baseURL: 'https://127.0.0.1:8000'      })).to.be.true;
 	});
 
 	describe("the default URL meta tags are invalid, because", () => {