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: TP47-ARIN
OrgTechName:   Pozar, Tim 
OrgTechPhone:  +1-415-665-3790 
OrgTechEmail:  pozar@twop.co
OrgTechRef:    https://rdap.arin.net/registry/entity/TP47-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: LASSO11-ARIN
OrgTechName:   Lassoff, Jonathan 
OrgTechPhone:  +1-415-215-2464 
OrgTechEmail:  jof@thejof.com
OrgTechRef:    https://rdap.arin.net/registry/entity/LASSO11-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" : [ "TP47-ARIN", "LASSO11-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" : "TP47-ARIN",
    "name" : "Pozar, Tim",
    "email" : [ "pozar@twop.co" ],
    "phone" : [ "+1-415-665-3790" ],
    "source" : "https://rdap.arin.net/registry/entity/TP47-ARIN"
  }, {
    "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" : "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
AS40627	RingCentral Inc	US
AS46276	SmarterBroadband	US
AS4229	Zenlayer Inc	US
AS293	ESnet	US
AS32329	Another Corporate ISP, LLC	US
AS58511	Anycast Holdings Pty Ltd	AU
AS13896	8x8, Inc.	US
AS6614	T Mobile USA, Inc.	US
AS13427	Softcom Internet Communications, Inc.	US
AS36012	HUNTER COMMUNICATIONS	US
AS400318	Versa Networks, Inc.	US
AS139341	ACEVILLE PTE.LTD.	SG
AS63399	Dialpad, Inc.	US
AS24429	Zhejiang Taobao Network Co.,Ltd	CN
AS36210	Moscone Center Joint Ventures	US
AS33425	CoreWeave, Inc	US
AS11983	Tiktok U.S. Data Security Inc.	US
AS6507	Riot Games, Inc	US
AS27281	Quantcast Corporation	US
AS6140	Two P	US
AS1828	Unitas Global	US
AS14203	Juniper Networks, Inc.	US
AS55819	CAMPAIGN MONITOR PTY LTD	AU
AS16740	DOXX.NET CORPORATION	US
AS40401	Backblaze Inc	US
AS32787	Akamai Technologies, Inc.	US
AS30103	Zoom Video Communications, Inc	US
AS54825	Packet Host, Inc.	US
AS54600	PEG TECH INC	US
AS398704	STACKS INC	US
AS132203	Shenzhen Tencent Computer Systems Company Limited	CN
AS53471	Netskrt	CA
AS16880	TREND MICRO INCORPORATED	US
AS4455	IX Reach Ltd	GB
AS30041	Race Tech, LLC	US
AS55244	Blue Origin Enterprises, L.P.	US
AS25751	Conversant, Inc.	US
AS26459	The Trade Desk, Inc.	US
AS22616	ZSCALER, INC.	US
AS58907	Acquire BPO Pty Ltd	AU
AS2635	Automattic, Inc	US
AS19551	Incapsula Inc	US
AS38195	SUPERLOOP AUSTRALIA PTY LTD	AU
AS42	WoodyNet, Inc.	US
AS35280	F5 Networks SARL	FR
AS30383	General Motors LLC	US
AS33548	Unwired Broadband, LLC	US
AS4826	VOCUS PTY LTD	AU
AS49544	i3D.net B.V	NL
AS6939	Hurricane Electric LLC	US
AS20940	Akamai International B.V.	NL
AS62955	eBay, Inc	US
AS36351	IBM Cloud	US
AS396298	Acreto	US
AS134521	Dialpad, Inc.	US
AS397554	Happy Cycling LLC	US
AS54113	Fastly, Inc.	US
AS16552	Tiggee LLC	US

Upstreams

AS Number	Description	Country
AS6939	Hurricane Electric LLC	US

Downstreams

AS Number	Description	Country
AS35008	Kerfuffle, LLC	US
AS6140	Two P	US