How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS401957 Client side development, Inc.

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

ASN Lookup Tool

Search ASN

AS Data

IP Routes

Raw Whois

Parsed Whois

Peers

Upstreams

Downstreams

Legacy Routes

Client side development, Inc. cside.dev

US 0 Routes

AS Data

AS401957

AS401957 – Client side development, Inc.

AS Number	401957
AS Name	CSIDE
Organization	Client side development, Inc. (cd-1098)
Country	US
Website	cside.dev
Number of IPv4 Routes	0
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2025-09-09

ASN Intelligence API for production workflows

Use ASN data for AS401957 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       401957
ASName:         CSIDE
ASHandle:       AS401957
RegDate:        2025-09-09
Updated:        2025-09-09
Comment:        http://www.cside.dev
Ref:            https://rdap.arin.net/registry/autnum/401957


OrgName:        Client-side development, Inc.
OrgId:          CD-1098
Address:        1111B S Governors Ave STE 7601
City:           Dover
StateProv:      DE
PostalCode:     19904
Country:        US
RegDate:        2025-07-22
Updated:        2025-08-28
Ref:            https://rdap.arin.net/registry/entity/CD-1098


OrgTechHandle: WIJCK1-ARIN
OrgTechName:   Wijckmans, Simon 
OrgTechPhone:  +1-515-493-2732 
OrgTechEmail:  hello@cside.dev
OrgTechRef:    https://rdap.arin.net/registry/entity/WIJCK1-ARIN

OrgAbuseHandle: WIJCK1-ARIN
OrgAbuseName:   Wijckmans, Simon 
OrgAbusePhone:  +1-515-493-2732 
OrgAbuseEmail:  hello@cside.dev
OrgAbuseRef:    https://rdap.arin.net/registry/entity/WIJCK1-ARIN

OrgNOCHandle: MOMPO1-ARIN
OrgNOCName:   Mompo, Rodrigo 
OrgNOCPhone:  +1-561-816-2220 
OrgNOCEmail:  rodrigo@cside.dev
OrgNOCRef:    https://rdap.arin.net/registry/entity/MOMPO1-ARIN

OrgTechHandle: MOMPO1-ARIN
OrgTechName:   Mompo, Rodrigo 
OrgTechPhone:  +1-561-816-2220 
OrgTechEmail:  rodrigo@cside.dev
OrgTechRef:    https://rdap.arin.net/registry/entity/MOMPO1-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "401957",
    "as_handle" : "AS401957",
    "as_name" : "CSIDE",
    "tech_contacts" : [ "WIJCK1-ARIN", "MOMPO1-ARIN" ],
    "abuse_contacts" : [ "WIJCK1-ARIN" ],
    "date_created" : "2025-09-09",
    "date_updated" : "2025-09-09",
    "source" : "https://rdap.arin.net/registry/autnum/401957"
  } ],
  "organization" : {
    "handle" : "CD-1098",
    "name" : "Client-side development, Inc.",
    "address" : [ "1111B S Governors Ave STE 7601", "Dover", "DE", "19904", "US" ],
    "street" : "S Governors Ave",
    "city" : "Dover",
    "state" : "DE",
    "zip_code" : "19904",
    "country" : [ "US" ],
    "date_created" : "2025-07-22",
    "date_updated" : "2025-08-28",
    "source" : "https://rdap.arin.net/registry/entity/CD-1098",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "WIJCK1-ARIN",
    "name" : "Wijckmans, Simon",
    "email" : [ "hello@cside.dev" ],
    "phone" : [ "+1-515-493-2732" ],
    "source" : "https://rdap.arin.net/registry/entity/WIJCK1-ARIN"
  }, {
    "handle" : "MOMPO1-ARIN",
    "name" : "Mompo, Rodrigo",
    "email" : [ "rodrigo@cside.dev" ],
    "phone" : [ "+1-561-816-2220" ],
    "source" : "https://rdap.arin.net/registry/entity/MOMPO1-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "WIJCK1-ARIN",
    "name" : "Wijckmans, Simon",
    "email" : [ "hello@cside.dev" ],
    "phone" : [ "+1-515-493-2732" ],
    "source" : "https://rdap.arin.net/registry/entity/WIJCK1-ARIN"
  } ]
}

Frequently Asked Questions

What is ASN AS401957?

ASN AS401957 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS401957?

AS401957 is listed under Client side development, Inc..

What do peers, upstreams, and downstreams mean?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.