What is ASN AS203939?

ASN AS203939 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS203939?

AS203939 is listed under Mosaic Data Services, Inc..

What do peers, upstreams, and downstreams mean in ASN data?

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 shown for an ASN?

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

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.

AS203939 Mosaic Data Services, Inc.

ASN Lookup Tool

Mosaic Data Services, Inc. mosaicdataservices.com

US 5 Routes

AS Data

AS203939

AS203939 – Mosaic Data Services, Inc.

AS Number	203939
AS Name	MOSAIC
Organization	Mosaic Data Services, Inc. (mds-109)
Country	US
Website	mosaicdataservices.com
Number of IPv4 Routes	3
Number of IPv6 Routes	2
ASN type	ISP
Registry	ARIN
Date Allocated	2026-03-05

ASN Intelligence API for production workflows

Use ASN data for AS203939 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

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2a06:bc40::/29	AS203939	Mosaic Data Services, Inc.	Mosaic Data Services, Inc.	~634×10²⁷
185.204.14.0/23	AS203939	Mosaic Data Services, Inc.	Mosaic Data Services, Inc.	512
185.125.184.0/22	AS203939	Mosaic Data Services, Inc.	MDS HOSTING	1024
23.136.116.0/24	AS203939	Mosaic Data Services, Inc.	Mosaic Data Services, Inc.	256
2602:f6a7::/36	AS203939	Mosaic Data Services, Inc.	Mosaic Data Services, Inc.	~5×10²⁷

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:       203939
ASName:         MOSAIC
ASHandle:       AS203939
RegDate:        2026-03-05
Updated:        2026-03-05
Ref:            https://rdap.arin.net/registry/autnum/203939


OrgName:        Mosaic Data Services, Inc.
OrgId:          MDS-109
Address:        618 Centerpoint Way, #83203
City:           Gaithersburg
StateProv:      MD
PostalCode:     20883
Country:        US
RegDate:        2012-05-11
Updated:        2025-03-19
Comment:        http://www.mosaicdataservices.com
Comment:        Business Office: 9am to 5pm EST
Comment:        NOC Support: 24/7
Ref:            https://rdap.arin.net/registry/entity/MDS-109


OrgAbuseHandle: BACHJ-ARIN
OrgAbuseName:   Bach, Jason 
OrgAbusePhone:  +1-240-399-3900 
OrgAbuseEmail:  jbach@mosaicdataservices.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/BACHJ-ARIN

OrgTechHandle: BACHJ-ARIN
OrgTechName:   Bach, Jason 
OrgTechPhone:  +1-240-399-3900 
OrgTechEmail:  jbach@mosaicdataservices.com
OrgTechRef:    https://rdap.arin.net/registry/entity/BACHJ-ARIN

OrgNOCHandle: BACHJ-ARIN
OrgNOCName:   Bach, Jason 
OrgNOCPhone:  +1-240-399-3900 
OrgNOCEmail:  jbach@mosaicdataservices.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/BACHJ-ARIN

OrgTechHandle: JEAO-ARIN
OrgTechName:   O'Reilly, Justin E. Andrew
OrgTechPhone:  +1-240-422-9905 
OrgTechEmail:  joreilly@nellicus.net
OrgTechRef:    https://rdap.arin.net/registry/entity/JEAO-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" : "203939",
    "as_handle" : "AS203939",
    "as_name" : "MOSAIC",
    "tech_contacts" : [ "BACHJ-ARIN", "JEAO-ARIN" ],
    "abuse_contacts" : [ "BACHJ-ARIN" ],
    "date_created" : "2026-03-05",
    "date_updated" : "2026-03-05",
    "source" : "https://rdap.arin.net/registry/autnum/203939"
  } ],
  "organization" : {
    "handle" : "MDS-109",
    "name" : "Mosaic Data Services, Inc.",
    "address" : [ "618 Centerpoint Way,", "Gaithersburg", "MD", "20883", "US" ],
    "street" : "Centerpoint Way",
    "city" : "Gaithersburg",
    "state" : "MD",
    "zip_code" : "20883",
    "country" : [ "US" ],
    "date_created" : "2012-05-11",
    "date_updated" : "2025-03-19",
    "source" : "https://rdap.arin.net/registry/entity/MDS-109",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "BACHJ-ARIN",
    "name" : "Bach, Jason",
    "email" : [ "jbach@mosaicdataservices.com" ],
    "phone" : [ "+1-240-399-3900" ],
    "source" : "https://rdap.arin.net/registry/entity/BACHJ-ARIN"
  }, {
    "handle" : "JEAO-ARIN",
    "name" : "O'Reilly, Justin E. Andrew",
    "email" : [ "joreilly@nellicus.net" ],
    "phone" : [ "+1-240-422-9905" ],
    "source" : "https://rdap.arin.net/registry/entity/JEAO-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "BACHJ-ARIN",
    "name" : "Bach, Jason",
    "email" : [ "jbach@mosaicdataservices.com" ],
    "phone" : [ "+1-240-399-3900" ],
    "source" : "https://rdap.arin.net/registry/entity/BACHJ-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS6515	DACS IX	US
AS7784	Atlantech Online, Inc.	US
AS7010	NELLICUS, LLC	US

Upstreams

AS Number	Description	Country
AS6515	DACS IX	US
AS7784	Atlantech Online, Inc.	US