ASN AS40271 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS40271?

AS40271 is listed under San Francisco Metropolitan Internet Exchange SFMIX.

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?

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AS40271 San Francisco Metropolitan Internet Exchange SFMIX

ASN Lookup Tool

San Francisco Metropolitan Internet Exchange SFMIX sfmix.org

US 3 Routes

AS Data

AS40271

AS40271 – San Francisco Metropolitan Internet Exchange SFMIX

AS Number	40271
AS Name	SFMIX-TRANSIT
Organization	San Francisco Metropolitan Internet Exchange SFMIX (sfmies)
Country	US
Website	sfmix.org
Number of IPv4 Routes	2
Number of IPv6 Routes	1
ASN type	ISP
Registry	ARIN
Date Allocated	2024-09-11

ASN Intelligence API for production workflows

Use ASN data for AS40271 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
149.112.188.0/23	AS40271	San Francisco Metropolitan Internet Exchange SFMIX	San Francisco Metropolitan Internet Exchange SFMIX	512
149.112.115.0/24	AS40271	San Francisco Metropolitan Internet Exchange SFMIX	San Francisco Metropolitan Internet Exchange SFMIX	256
2620:11a:b002::/48	AS40271	San Francisco Metropolitan Internet Exchange SFMIX	San Francisco Metropolitan Internet Exchange SFMIX	~1×10²⁴

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:       40271
ASName:         SFMIX-TRANSIT
ASHandle:       AS40271
RegDate:        2024-09-11
Updated:        2024-09-11
Ref:            https://rdap.arin.net/registry/autnum/40271


OrgName:        San Francisco Metropolitan Internet Exchange (SFMIX)
OrgId:          SFMIES
Address:        PO Box 8243
City:           Emeryville
StateProv:      CA
PostalCode:     94662
Country:        US
RegDate:        2006-06-27
Updated:        2024-09-27
Ref:            https://rdap.arin.net/registry/entity/SFMIES


OrgTechHandle: LASSO11-ARIN
OrgTechName:   Lassoff, Jonathan 
OrgTechPhone:  +1-415-215-2464 
OrgTechEmail:  jof@thejof.com
OrgTechRef:    https://rdap.arin.net/registry/entity/LASSO11-ARIN

OrgAbuseHandle: STRA-ARIN
OrgAbuseName:   SFMIX Technical Role Account
OrgAbusePhone:  +1-877-365-6246 
OrgAbuseEmail:  tech-c@sfmix.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/STRA-ARIN

OrgTechHandle: TP47-ARIN
OrgTechName:   Pozar, Tim 
OrgTechPhone:  +1-415-637-8512 
OrgTechEmail:  pozar@lns.com
OrgTechRef:    https://rdap.arin.net/registry/entity/TP47-ARIN

OrgTechHandle: STRA-ARIN
OrgTechName:   SFMIX Technical Role Account
OrgTechPhone:  +1-877-365-6246 
OrgTechEmail:  tech-c@sfmix.org
OrgTechRef:    https://rdap.arin.net/registry/entity/STRA-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" : "40271",
    "as_handle" : "AS40271",
    "as_name" : "SFMIX-TRANSIT",
    "tech_contacts" : [ "LASSO11-ARIN", "TP47-ARIN", "STRA-ARIN" ],
    "abuse_contacts" : [ "STRA-ARIN" ],
    "date_created" : "2024-09-11",
    "date_updated" : "2024-09-11",
    "source" : "https://rdap.arin.net/registry/autnum/40271"
  } ],
  "organization" : {
    "handle" : "SFMIES",
    "name" : "San Francisco Metropolitan Internet Exchange (SFMIX)",
    "address" : [ "PO Box 8243", "Emeryville", "CA", "94662", "US" ],
    "city" : "Emeryville",
    "state" : "CA",
    "zip_code" : "94662",
    "country" : [ "US" ],
    "date_created" : "2006-06-27",
    "date_updated" : "2024-09-27",
    "source" : "https://rdap.arin.net/registry/entity/SFMIES",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "LASSO11-ARIN",
    "name" : "Lassoff, Jonathan",
    "email" : [ "jof@thejof.com" ],
    "phone" : [ "+1-415-215-2464" ],
    "source" : "https://rdap.arin.net/registry/entity/LASSO11-ARIN"
  }, {
    "handle" : "TP47-ARIN",
    "name" : "Pozar, Tim",
    "email" : [ "pozar@lns.com" ],
    "phone" : [ "+1-415-637-8512" ],
    "source" : "https://rdap.arin.net/registry/entity/TP47-ARIN"
  }, {
    "handle" : "STRA-ARIN",
    "name" : "SFMIX Technical Role Account",
    "email" : [ "tech-c@sfmix.org" ],
    "phone" : [ "+1-877-365-6246" ],
    "source" : "https://rdap.arin.net/registry/entity/STRA-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "STRA-ARIN",
    "name" : "SFMIX Technical Role Account",
    "email" : [ "tech-c@sfmix.org" ],
    "phone" : [ "+1-877-365-6246" ],
    "source" : "https://rdap.arin.net/registry/entity/STRA-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS62713	PubMatic, Inc.	US
AS2906	Netflix Streaming Services Inc.	US
AS6614	T-Mobile USA, Inc.	US
AS40627	RingCentral Inc	US
AS46276	SmarterBroadband	US
AS4229	Zenlayer Inc	US
AS199524	G-Core Labs S.A.	LU
AS32329	Another Corporate ISP, LLC	US
AS293	ESnet	US
AS17984	PCCW Global (HK) Ltd.	HK

Upstreams

AS Number	Description	Country
AS6939	Hurricane Electric LLC	US

Downstreams

AS Number	Description	Country
AS35008	Kerfuffle, LLC	US