AS27 UMDNET - University of Maryland

🇺🇸

ARINassigned

Announced Prefixes (BGP)

15total

9 IPv46 IPv6

IPv4 Addresses

Allocated (RIR)133,632

Announced (BGP)135,680

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)7.2×10²⁴

Prefix Limit (IPv4)

200

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

1984-08-28

Announced Prefixes

(BGP)15

Prefix	RPKI	IRR	Last Seen
38.172.164.0/24MOAS	Invalid	-	2026-10-10
38.172.165.0/24MOAS	Invalid	-	2026-10-10
38.172.166.0/24MOAS	Invalid	-	2026-10-10
38.172.167.0/24MOAS	Invalid	-	2026-10-10
128.8.0.0/16	No ROA	Other IRR	2026-10-10
129.2.0.0/16	No ROA	Other IRR	2026-10-10
192.54.94.0/23	No ROA	Other IRR	2026-10-10
192.54.96.0/21	No ROA	Other IRR	2026-10-10
192.54.100.0/22	No ROA	Other IRR	2026-10-10
2605:880::/48	No ROA	-	2026-10-10

1-10 of 15

1 / 2

(RIR)4

Prefix	Country	RIR	Status
128.8.0.0/16	🇺🇸 US	ARIN	allocated
129.2.0.0/16	🇺🇸 US	ARIN	allocated
192.54.94.0/23	🇺🇸 US	ARIN	allocated
192.54.96.0/21	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS27 hands its own prefixes to: transit providers, or peers at an exchange.

ASPA

No ASPA

External Links

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS27 should publish an ASPA object
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/27" | jq