AS42353 Simwood eSMS Limited

United Kingdom SIMWOOD RIPE 16 IPv4 prefixes 0 IPv6 prefixes

IPv4 addresses

3,584

IPv6 /48 networks

RPKI

15 valid1 no ROA

Peers and downstreams

Holder

AS name: SIMWOOD
Description: Simwood eSMS Limited
Organisation: Simwood eSMS Limited
Registered in: Bristol, United Kingdom
Abuse contact: noc@simwood.com
Assigned: 2007-02-06
Registered: 2007-02-07
Record last changed: 2021-03-05 11:54 UTC

178.22.136.0/21 178.22.136.0/23 178.22.136.0/24 178.22.137.0/24 178.22.139.0/24 178.22.140.0/23 178.22.140.0/24 178.22.141.0/24 178.22.142.0/24 178.22.143.0/24 185.63.140.0/24 185.63.141.0/24 185.63.142.0/24 185.63.143.0/24 194.0.210.0/24 91.233.5.0/24

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade C · 68/100

partly	Prefixes covered by valid ROAs 15 of 16 announced prefixes are RPKI valid, 1 have no ROA.	23/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
fail	Announces IPv6 No IPv6 prefixes are announced.	0/15
pass	More than one upstream 2 upstreams seen in BGP.	10/10
pass	Working abuse contact noc@simwood.com 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
fail	Registry record maintained Last changed 2021-03-05.	0/5

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/42353"><img src="https://ip-fd.net/badge/asn/42353/health.svg" alt="AS42353 network health on IP-FD.net"></a>

Markdown

[![AS42353 network health](https://ip-fd.net/badge/asn/42353/health.svg)](https://ip-fd.net/asn/42353)

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

Routing changes

Last 30 days

2026-10-04 05:27 UTC	Relationship changed	AS6939	upstream to peer
2026-10-04 05:27 UTC	Relationship changed	AS61049	upstream to peer
2026-10-04 05:27 UTC	Relationship changed	AS4455	upstream to peer
2026-10-04 05:27 UTC	New prefix	185.63.143.0/24
2026-10-04 05:27 UTC	New prefix	185.63.141.0/24

WHOIS

aut-num:        AS42353
as-name:        SIMWOOD
org:            ORG-SeL11-RIPE
descr:          Simwood eSMS Limited
remarks:        +-------------------------------------------------------+---------+
remarks:        | Simwood eSMS Limited | AS42353 |
remarks:        +-------------------------------------------------------+---------+
remarks:        | |
remarks:        | Sales: team@simwood.com |
remarks:        | Abuse Contact: abuse@simwood.com |
remarks:        | Peering Requests: peering@simwood.com |
remarks:        | |
remarks:        | |
remarks:        +-----------------------------------------------------------------+
remarks:        | IP Transit |
remarks:        +-----------------------------------------------------------------+
remarks:        +-----------------------------------------------------------------+
remarks:        | Peering |
remarks:        +-----------------------------------------------------------------+
remarks:        | Simwood has a generally open policy for both IPv4 and IPv6. Our |
remarks:        | network is dual stack and no tunnels are in use at any point. |
remarks:        | |
remarks:        | We are present at the following exchanges: |
remarks:        | |
remarks:        | LINX |
remarks:        | LoNAP |
remarks:        | IXManchester |
remarks:        | |
remarks:        | We will also peer privately in any of our sites where traffic |
remarks:        | justifies it. |
remarks:        | |
remarks:        | See http://as42353.peeringdb.com for details. |
remarks:        | |
remarks:        | Peer import/export information is not shown here. |
remarks:        | |
remarks:        +-----------------------------------------------------------------+
remarks:        | AS42353 Downstream Customers |
remarks:        +-----------------------------------------------------------------+
admin-c:        SW1897-RIPE
tech-c:         SW1897-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         SIMWOOD-MNT
created:        2007-02-07T12:23:46Z
last-modified:  2021-03-05T11:54:30Z
source:         RIPE
% 14 routing policy lines (import/export) not shown

Routing data

Updated 2 days ago

Registry record

Fetched 2 days 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/42353

const res = await fetch('https://ip-fd.net/api/v1/asn/42353', {
  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/42353', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/42353');
curl_setopt($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/42353", 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))

Works without a key at a lower rate. Get a free key.

AS3170	VeloxServ Communications Ltd VELOXSERV
AS4455	IX Reach Ltd BSO
AS6939	Hurricane Electric LLC HURRICANE
AS13237	euNetworks GmbH LAMBDANET-AS
AS24482	SG.GS SGGS-AS-AP
AS28792	Public Internet Ltd PUBLIC-INTERNET
AS36236	NetActuate, Inc NETACTUATE
AS48070	DSM (GB) Limited DSM
AS61049	Exascale Ltd EXASCALE

AS174
AS2914	NTT America, Inc. NTT-DATA-2914