What is ASN AS398572?

ASN AS398572 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS398572?

AS398572 is listed under Monolithic Power Systems,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.

AS398572 Monolithic Power Systems,Inc

ASN Lookup Tool

Monolithic Power Systems,Inc monolithicpower.com

US 2 Routes

AS Data

AS398572

AS398572 – Monolithic Power Systems,Inc

AS Number	398572
AS Name	MONOLITHICPOWER-SJC
Organization	Monolithic Power Systems,Inc (mps-302)
Country	US
Website	monolithicpower.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2020-07-14

ASN Intelligence API for production workflows

Use ASN data for AS398572 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
50.220.216.0/24	AS398572	Monolithic Power Systems,Inc	Comcast Cable Communications, LLC	256
64.112.67.0/24	AS398572	Monolithic Power Systems,Inc	Monolithic Power Systems,Inc	256

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:       398572
ASName:         MONOLITHICPOWER-SJC
ASHandle:       AS398572
RegDate:        2020-07-14
Updated:        2020-07-14
Ref:            https://rdap.arin.net/registry/autnum/398572


OrgName:        Monolithic Power Systems,Inc
OrgId:          MPS-302
Address:        79 Great Oaks Blvd
City:           San Jose
StateProv:      CA
PostalCode:     95119
Country:        US
RegDate:        2020-06-18
Updated:        2024-11-25
Comment:        https://www.monolithicpower.com
Ref:            https://rdap.arin.net/registry/entity/MPS-302


OrgTechHandle: MPSIT-ARIN
OrgTechName:   MPS IT
OrgTechPhone:  +1-408-826-0685 
OrgTechEmail:  mpsit-arin@monolithicpower.com
OrgTechRef:    https://rdap.arin.net/registry/entity/MPSIT-ARIN

OrgRoutingHandle: MPSIT-ARIN
OrgRoutingName:   MPS IT
OrgRoutingPhone:  +1-408-826-0685 
OrgRoutingEmail:  mpsit-arin@monolithicpower.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/MPSIT-ARIN

OrgNOCHandle: MPSIT-ARIN
OrgNOCName:   MPS IT
OrgNOCPhone:  +1-408-826-0685 
OrgNOCEmail:  mpsit-arin@monolithicpower.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/MPSIT-ARIN

OrgAbuseHandle: MPSIT-ARIN
OrgAbuseName:   MPS IT
OrgAbusePhone:  +1-408-826-0685 
OrgAbuseEmail:  mpsit-arin@monolithicpower.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MPSIT-ARIN

OrgDNSHandle: MPSIT-ARIN
OrgDNSName:   MPS IT
OrgDNSPhone:  +1-408-826-0685 
OrgDNSEmail:  mpsit-arin@monolithicpower.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/MPSIT-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" : "398572",
    "as_handle" : "AS398572",
    "as_name" : "MONOLITHICPOWER-SJC",
    "admin_contacts" : [ "MPSIT-ARIN" ],
    "tech_contacts" : [ "MPSIT-ARIN", "MPSIT-ARIN" ],
    "abuse_contacts" : [ "MPSIT-ARIN" ],
    "date_created" : "2020-07-14",
    "date_updated" : "2020-07-14",
    "source" : "https://rdap.arin.net/registry/autnum/398572"
  } ],
  "organization" : {
    "handle" : "MPS-302",
    "name" : "Monolithic Power Systems,Inc",
    "address" : [ "79 Great Oaks Blvd", "San Jose", "CA", "95119", "US" ],
    "street" : "Great Oaks Blvd",
    "city" : "San Jose",
    "state" : "CA",
    "zip_code" : "95119",
    "country" : [ "US" ],
    "date_created" : "2020-06-18",
    "date_updated" : "2024-11-25",
    "source" : "https://rdap.arin.net/registry/entity/MPS-302",
    "addressCountry" : "US"
  },
  "administrative_contacts" : [ {
    "handle" : "MPSIT-ARIN",
    "name" : "MPS IT",
    "email" : [ "mpsit-arin@monolithicpower.com" ],
    "phone" : [ "+1-408-826-0685" ],
    "source" : "https://rdap.arin.net/registry/entity/MPSIT-ARIN"
  } ],
  "technical_contacts" : [ {
    "handle" : "MPSIT-ARIN",
    "name" : "MPS IT",
    "email" : [ "mpsit-arin@monolithicpower.com" ],
    "phone" : [ "+1-408-826-0685" ],
    "source" : "https://rdap.arin.net/registry/entity/MPSIT-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MPSIT-ARIN",
    "name" : "MPS IT",
    "email" : [ "mpsit-arin@monolithicpower.com" ],
    "phone" : [ "+1-408-826-0685" ],
    "source" : "https://rdap.arin.net/registry/entity/MPSIT-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS33667	Comcast Cable Communications, LLC	US
AS33651	Comcast Cable Communications, LLC	US
AS36734	Paxio Inc.	US

Upstreams

AS Number	Description	Country
AS33667	Comcast Cable Communications, LLC	US
AS33651	Comcast Cable Communications, LLC	US
AS36734	Paxio Inc.	US