Home Prefix Lookup18.172.0.0/15

18.172.0.0/15 - BGP Prefix

IPv4ARINnot announced Anycast RPKI Valid

CIDR

18.172.0.0/15

IP Version

IPv4

Addresses

131K

Mask

/15 (255.254.0.0)

Country

🇺🇸 United States

City

Seattle

RIR

ARIN

Status

not announced

Allocated

Announced BGP Routes

0 of 0 routes

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
This prefix is not announced as a whole. Parts of it are announced as more-specific prefixes, see below.

More-Specific Announcements

132 more-specific announcements on this page, 332 in total

Prefix	Origin AS	RPKI	IRR	Last Seen
18.173.61.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.62.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.63.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.64.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.65.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.66.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.67.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.68.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.69.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.70.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.71.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.72.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.73.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.74.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.75.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.76.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.77.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.78.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.79.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.80.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.81.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.82.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.83.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.84.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.85.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.86.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.87.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.88.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.89.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.90.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.91.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.92.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.93.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.94.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.95.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.96.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.97.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.98.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.99.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.100.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.101.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.102.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.103.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.104.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.105.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.106.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.107.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.108.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.109.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.110.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.111.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.112.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.115.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.116.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.120.0/21	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.130.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.132.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.136.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.140.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.142.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.145.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.146.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.148.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.150.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.153.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.154.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.156.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.160.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.164.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.166.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.168.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.172.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.173.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.174.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.176.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.178.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.183.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.184.0/21	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.184.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.185.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.186.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.187.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.188.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.189.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.190.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.191.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.192.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.192.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.193.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.194.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.195.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.196.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.200.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.203.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.204.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.204.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.205.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.206.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.207.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.208.0/21	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.208.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.209.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.210.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.211.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.212.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.213.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.214.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.215.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.218.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.220.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.223.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.224.0/21	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.224.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.225.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.226.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.227.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.228.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.229.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.230.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.231.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.232.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.232.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.233.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.234.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.235.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.236.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.240.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.244.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.246.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.248.0/22	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.252.0/23	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12
18.173.254.0/24	AS16509 AMAZON-02 - Amazon.com, Inc.	Valid	-	2026-10-12

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
18.172.0.0/15	AS16509	/24	arin

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS16509	Other IRR	MAINT-AS16509	2023-11-13

Transfer History

Registry transfers of 18.172.0.0/15, blocks inside it, or blocks containing it.

18.172.0.0/15Transfer · 2018-06-29
Massachusetts Institute of Technology
🇺🇸 US ARIN
→
Amazon Technologies Inc.
🇺🇸 US ARIN

Date	Resource	From	To	Type
2018-06-29	18.172.0.0/15	Massachusetts Institute of Technology 🇺🇸 US ARIN	Amazon Technologies Inc. 🇺🇸 US ARIN	Transfer

Geolocation

This is an anycast prefix. The location shown is the organization HQ - actual server location varies by your network path.

Country🇺🇸United StatesUS

RegionWashington

CitySeattle

TimezoneAmerica/Los_Angeles

Coordinates47.6062, -122.3321 ↗

Learn more

RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
RPKI validatorCheck ROA coverage for any prefix or ASN
What is BGP?How prefixes are announced and routed
More-specific prefixesGlossary: covering and more-specific routes
IPv4 transfers in the ARIN regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/18.172.0.0/15

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/18.172.0.0/15" | jq

External Links

RIPEstat