AS15518 Circular Informationssysteme GmbH

Germany CIRC-AS RIPE 5 IPv4 prefixes 1 IPv6 prefix

IPv4 addresses

8,192

IPv6 /48 networks

65,536

RPKI

6 valid0 no ROA

Peers and downstreams

Holder

AS name: CIRC-AS
Description: Schulze-Delitzsch-Str.36 70565 Stuttgart Germany
Organisation: Circular Informationssysteme GmbH
Registered in: Stuttgart, Germany
Abuse contact: guardian@circular.net
Assigned: 2000-07-24
Registered: 2002-08-22
Record last changed: 2025-10-24 11:09 UTC

212.86.160.0/20 212.86.180.0/22 212.86.188.0/22 213.153.64.0/22 213.153.72.0/22

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade A · 90/100

pass	Prefixes covered by valid ROAs 6 of 6 announced prefixes are RPKI valid.	25/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 1 IPv6 prefix.	15/15
pass	More than one upstream 2 upstreams seen in BGP.	10/10
pass	Working abuse contact guardian@circular.net is published.	15/15
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
pass	Registry record maintained Last changed 2025-10-24.	5/5

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/15518"><img src="https://ip-fd.net/badge/asn/15518/health.svg" alt="AS15518 network health on IP-FD.net"></a>

Markdown

[![AS15518 network health](https://ip-fd.net/badge/asn/15518/health.svg)](https://ip-fd.net/asn/15518)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

No changes recorded in the last 30 days. Changes are recorded each time the routing data of this AS is refreshed. Get alerts in real time.

WHOIS

aut-num:        AS15518
as-name:        CIRC-AS
descr:          Schulze-Delitzsch-Str.36
descr:          70565 Stuttgart
descr:          Germany
org:            ORG-cIG1-RIPE
admin-c:        CIR-RIPE
tech-c:         CIR-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
remarks:        AS220 COLT Internet
remarks:        AS5400 BT
mnt-by:         CIRCULAR-NOC
mnt-by:         CIRCULAR-NET
created:        2002-08-22T16:07:20Z
last-modified:  2025-10-24T11:09:21Z
source:         RIPE
% 5 routing policy lines (import/export) not shown

Routing data

Updated 3 h ago

Registry record

Fetched 3 h ago from RIPE

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/15518

const res = await fetch('https://ip-fd.net/api/v1/asn/15518', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/15518', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/15518');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/15518", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

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AS5400	British Telecommunications Limited BT
AS8220	COLT Technology Services Group Limited COLT