$url, CURLOPT_RETURNTRANSFER => true, CURLOPT_TIMEOUT => 8, CURLOPT_FOLLOWLOCATION => true, CURLOPT_SSL_VERIFYPEER => false, CURLOPT_USERAGENT => 'ipcheck.tools/1.0', CURLOPT_HTTPHEADER => ['Accept: application/json'], ]); $json = curl_exec($ch); $code = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch); if (!$json || $code >= 400) return null; return json_decode($json, true); } if ($query) { $asn_num = preg_replace('/^AS/i', '', $query); $asn_num = preg_replace('/[^0-9]/', '', $asn_num); $asn = 'AS' . $asn_num; if (!$asn_num) { $error = 'Invalid ASN. Please use format AS3320 or 3320.'; } else { $rdap = api_get_en("https://rdap.db.ripe.net/autnum/{$asn_num}"); if (!$rdap) $rdap = api_get_en("https://rdap.arin.net/registry/autnum/{$asn_num}"); $ripe_prefixes = api_get_en("https://stat.ripe.net/data/announced-prefixes/data.json?resource=AS{$asn_num}"); $ripe_upstreams = api_get_en("https://stat.ripe.net/data/asn-neighbours/data.json?resource=AS{$asn_num}"); if (!$rdap) { $error = 'ASN ' . h($asn) . ' not found.'; } else { $name = $rdap['name'] ?? $asn; $org = $rir = $abuse_email = ''; foreach ($rdap['entities'] ?? [] as $entity) { $roles = $entity['roles'] ?? []; $fn = ''; foreach ($entity['vcardArray'][1] ?? [] as $vcard) { if (($vcard[0] ?? '') === 'fn') $fn = $vcard[3] ?? ''; } if (in_array('registrant', $roles) && !$org) $org = $fn; if (in_array('abuse', $roles)) { foreach ($entity['vcardArray'][1] ?? [] as $v) { if (($v[0] ?? '') === 'email') $abuse_email = $v[3] ?? ''; } } } foreach ($rdap['links'] ?? [] as $link) { $href = $link['href'] ?? ''; if (str_contains($href, 'ripe.net')) $rir = 'RIPE NCC'; if (str_contains($href, 'arin.net')) $rir = 'ARIN'; if (str_contains($href, 'apnic.net')) $rir = 'APNIC'; if (str_contains($href, 'lacnic.net')) $rir = 'LACNIC'; if (str_contains($href, 'afrinic.net')) $rir = 'AFRINIC'; } $created = $updated = ''; foreach ($rdap['events'] ?? [] as $event) { $date = isset($event['eventDate']) ? date('d.m.Y', strtotime($event['eventDate'])) : ''; if ($event['eventAction'] === 'registration') $created = $date; if ($event['eventAction'] === 'last changed') $updated = $date; } $ipv4_prefixes = $ipv6_prefixes = []; foreach ($ripe_prefixes['data']['prefixes'] ?? [] as $p) { $prefix = $p['prefix'] ?? ''; if (str_contains($prefix, ':')) $ipv6_prefixes[] = ['prefix' => $prefix]; else $ipv4_prefixes[] = ['prefix' => $prefix]; } $upstreams_v4 = $peers_v4 = []; foreach ($ripe_upstreams['data']['neighbours'] ?? [] as $n) { $entry = ['asn' => $n['asn'], 'name' => 'AS' . $n['asn']]; if (($n['type'] ?? '') === 'left') $upstreams_v4[] = $entry; else $peers_v4[] = $entry; } foreach ($upstreams_v4 as $idx => $up) { if ($idx >= 10) break; $r = api_get_en("https://rdap.db.ripe.net/autnum/{$up['asn']}"); if (!$r) $r = api_get_en("https://rdap.arin.net/registry/autnum/{$up['asn']}"); if ($r && isset($r['name'])) $upstreams_v4[$idx]['name'] = $r['name']; } $result = [ 'asn' => $asn, 'asn_num' => $asn_num, 'name' => $name, 'description' => $org, 'country_code' => $rdap['country'] ?? '', 'abuse_email' => $abuse_email, 'rir' => $rir, 'allocated' => $created, 'updated' => $updated, 'ipv4_prefixes' => array_slice($ipv4_prefixes, 0, 20), 'ipv6_prefixes' => array_slice($ipv6_prefixes, 0, 10), 'ipv4_count' => count($ipv4_prefixes), 'ipv6_count' => count($ipv6_prefixes), 'upstreams_v4' => array_slice($upstreams_v4, 0, 10), 'peers_v4' => array_slice($peers_v4, 0, 20), 'peers_v4_count' => count($peers_v4), ]; } } } require_once __DIR__ . '/header.php'; ?>
Tool
ASN Lookup
Networks, upstreams, peers and prefixes of an autonomous system
ASN
RIR
IPv4 Prefixes
IPv6 Prefixes
AS Information
ASN
Name
Organisation
Country –
RIR
Allocated
Abuse contact
Network Overview
IPv4 Prefixes
IPv6 Prefixes
Upstreams IPv4
BGP Peers IPv4
Upstreams (Transit Providers)
IPv4
AS
IPv4 Prefixes ( total 20 ? ', showing 20' : '' ?>)
IPv6 Prefixes ( total 10 ? ', showing 10' : '' ?>)
BGP Peers IPv4 ( total 20 ? ', showing 20' : '' ?>)
AS
Enter an ASN to retrieve networks, upstreams, peers and prefixes. Format: AS3320 or 3320.
Known ASNs
My IP ASN Lookup IP Lookup WHOIS DNS Lookup

What is an ASN?

An Autonomous System Number (ASN) is a unique number assigned to a network on the internet. Upstreams are the transit providers through which the AS reaches the internet. Peers are networks with which direct traffic exchange takes place. Prefixes are the IP address ranges that the AS announces to the internet. Data via RIPE NCC RDAP and RIPEstat API.