ASN AS19105 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS19105?

AS19105 is listed under FirstBank.

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.

AS19105 FirstBank | IPGeolocation.io

ASN Lookup Tool

FirstBank efirstbank.com

US 5 Routes

AS Data

AS19105

AS19105 – FirstBank

AS Number	19105
AS Name	FIRSTBANK
Organization	FirstBank(first-567)
Country	US
Website	efirstbank.com
Number of IPv4 Routes	5
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2000-11-20

ASN Intelligence API for production workflows

Use ASN data for AS19105 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.89.183.0/24	AS19105	FirstBank	FirstBank	256
205.243.23.0/24	AS19105	FirstBank	FIRST BANK DATA CORP	256
208.89.180.0/24	AS19105	FirstBank	FirstBank	256
208.89.182.0/24	AS19105	FirstBank	FirstBank	256
208.89.181.0/24	AS19105	FirstBank	FirstBank	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:       19105
ASName:         FIRSTBANK
ASHandle:       AS19105
RegDate:        2000-11-20
Updated:        2016-01-28    
Ref:            https://rdap.arin.net/registry/autnum/19105


OrgName:        FirstBank
OrgId:          FIRST-567
Address:        12345 W Colfax Ave
City:           Lakewood
StateProv:      CO
PostalCode:     80215
Country:        US
RegDate:        2015-10-06
Updated:        2024-07-09
Ref:            https://rdap.arin.net/registry/entity/FIRST-567


OrgAbuseHandle: JOHNS4334-ARIN
OrgAbuseName:   Johnson, Alan 
OrgAbusePhone:  +1-515-299-0521 
OrgAbuseEmail:  alan.johnson@efirstbank.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/JOHNS4334-ARIN

OrgNOCHandle: JOHNS4334-ARIN
OrgNOCName:   Johnson, Alan 
OrgNOCPhone:  +1-515-299-0521 
OrgNOCEmail:  alan.johnson@efirstbank.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/JOHNS4334-ARIN

OrgTechHandle: JOHNS4334-ARIN
OrgTechName:   Johnson, Alan 
OrgTechPhone:  +1-515-299-0521 
OrgTechEmail:  alan.johnson@efirstbank.com
OrgTechRef:    https://rdap.arin.net/registry/entity/JOHNS4334-ARIN

OrgDNSHandle: JOHNS4334-ARIN
OrgDNSName:   Johnson, Alan 
OrgDNSPhone:  +1-515-299-0521 
OrgDNSEmail:  alan.johnson@efirstbank.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/JOHNS4334-ARIN

OrgTechHandle: SHERR48-ARIN
OrgTechName:   Sherry, Bill 
OrgTechPhone:  +1-303-235-1207 
OrgTechEmail:  bill.sherry@efirstbank.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SHERR48-ARIN

OrgDNSHandle: SHERR48-ARIN
OrgDNSName:   Sherry, Bill 
OrgDNSPhone:  +1-303-235-1207 
OrgDNSEmail:  bill.sherry@efirstbank.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/SHERR48-ARIN

OrgAbuseHandle: SHERR48-ARIN
OrgAbuseName:   Sherry, Bill 
OrgAbusePhone:  +1-303-235-1207 
OrgAbuseEmail:  bill.sherry@efirstbank.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SHERR48-ARIN

OrgRoutingHandle: JOHNS4334-ARIN
OrgRoutingName:   Johnson, Alan 
OrgRoutingPhone:  +1-515-299-0521 
OrgRoutingEmail:  alan.johnson@efirstbank.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/JOHNS4334-ARIN

OrgNOCHandle: SHERR48-ARIN
OrgNOCName:   Sherry, Bill 
OrgNOCPhone:  +1-303-235-1207 
OrgNOCEmail:  bill.sherry@efirstbank.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/SHERR48-ARIN

OrgRoutingHandle: SHERR48-ARIN
OrgRoutingName:   Sherry, Bill 
OrgRoutingPhone:  +1-303-235-1207 
OrgRoutingEmail:  bill.sherry@efirstbank.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/SHERR48-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

Peers

AS Number	Description	Country
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS209	CenturyLink Communications, LLC	US
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US

Upstreams

AS Number	Description	Country
AS209	CenturyLink Communications, LLC	US
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US