diff --git a/inc/functions.php b/inc/functions.php
index 4a8aa053..b515ef29 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -1845,32 +1845,71 @@ function checkIPAPI(string $ip): bool {
 		return false;
 	}
 
-	$ch = curl_init();
-	curl_setopt($ch, CURLOPT_URL, "http://v2.api.iphub.info/ip/$ip");
-	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
-	curl_setopt($ch, CURLOPT_HTTPHEADER, [ "X-Key: $iphub_key" ]);
-	$reply = curl_exec($ch);
-	if ($reply === false) {
-		$curl_err = curl_error($ch);
+	$ret = false;
+	if ($config['cache']['enabled']) {
+		$ret = cache::get("ip_api_block_$ip");
+	}
+
+	if ($ret === false) {
+		$ch = curl_init();
+		curl_setopt($ch, CURLOPT_URL, "http://v2.api.iphub.info/ip/$ip");
+		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+		curl_setopt($ch, CURLOPT_HTTPHEADER, [ "X-Key: $iphub_key" ]);
+		$reply = curl_exec($ch);
+		if ($reply === false) {
+			$curl_err = curl_error($ch);
+			curl_close($ch);
+			error_log("IPHub query failed: api call failed with curl error $curl_err");
+
+			if ($config['cache']['enabled']) {
+				// Store the result for 4 hours.
+				cache::set("ip_api_block_$ip", 'api_error', 14400);
+			}
+
+			return false;
+		}
 		curl_close($ch);
-		error_log("IPHub query failed: api call failed with curl error $curl_err");
-		return false;
-	}
-	curl_close($ch);
-	if (empty($reply)) {
-		error_log('IPHub query failed: api returned an empty response');
+		if (empty($reply)) {
+			error_log('IPHub query failed: api returned an empty response');
+
+			if ($config['cache']['enabled']) {
+				// Store the result for 4 hours.
+				cache::set("ip_api_block_$ip", 'api_error', 14400);
+			}
+
+			return false;
+		}
+
+		$json = json_decode($reply);
+		if (isset($json->error)) {
+			error_log("IPHub query failed: $json->error");
+
+			if ($config['cache']['enabled']) {
+				// Store the result for 4 hours.
+				cache::set("ip_api_block_$ip", 'api_error', 14400);
+			}
+
+			return false;
+		}
+
+		$ret = [
+			'block' => $json['block'],
+			'isp' => $json['isp'],
+			'asn' => $json['asn']
+		];
+
+		if ($config['cache']['enabled']) {
+			// Store the result for 2 days.
+			cache::set("ip_api_block_$ip", $ret, 172800);
+		}
+	} elseif (!is_array($ret)) {
+		// Cache previously reported an error, just return.
 		return false;
 	}
 
-	$json = json_decode($reply);
-	if (isset($json->error)) {
-		error_log("IPHub query failed: $json->error");
-		return false;
-	}
-
-	if ($json->block == 1
-		|| array_search($json->isp, $config['ip_api']['isp_blacklist']) !== false
-		|| array_search($json->asn, $config['ip_api']['asn_blacklist']) !== false) {
+	if ($ret['block'] == 1
+		|| array_search($ret['isp'], $config['ip_api']['isp_blacklist']) !== false
+		|| array_search($ret['asn'], $config['ip_api']['asn_blacklist']) !== false) {
 		error($config['error']['proxy']);
 		return true;
 	}