asn.dev

Address space

AS7377 UCSD

Education ARIN Educational/Research

IPv4 prefixes 779 12.13M addresses
IPv6 prefixes 34
Most common size /24 IPv4
Flagged 20

Shape

IPv4 prefix sizes

All IPv4
/12
/12: 1
1
/13
/13: 4
4
/14
/14: 2
2
/15
/15: 17
17
/16
/16: 43
43
/17
/17: 44
44
/18
/18: 54
54
/19
/19: 53
53
/20
/20: 71
71
/21
/21: 74
74
/22
/22: 94
94
/23
/23: 120
120
/24
/24: 199
199
/30
/30: 2
2
/31
/31: 1
1

A wall of /24s usually means many small customer assignments or fine-grained traffic engineering; a few short prefixes means large contiguous allocations announced whole.

Shape

IPv6 prefix sizes

All IPv6
/33
/33: 1
1
/34
/34: 2
2
/35
/35: 1
1
/36
/36: 1
1
/37
/37: 1
1
/38
/38: 1
1
/39
/39: 1
1
/40
/40: 1
1
/41
/41: 1
1
/42
/42: 1
1
/43
/43: 1
1
/44
/44: 1
1
/45
/45: 1
1
/46
/46: 1
1
/47
/47: 1
1
/48
/48: 1
1
/49
/49: 1
1
/50
/50: 1
1
/51
/51: 1
1
/52
/52: 1
1
/53
/53: 1
1
/54
/54: 1
1
/55
/55: 1
1
/56
/56: 1
1
/57
/57: 1
1
/58
/58: 1
1
/59
/59: 1
1
/60
/60: 1
1
/61
/61: 1
1
/62
/62: 1
1
/63
/63: 1
1
/64
/64: 1
1
/122
/122: 1
1

Geography

Where the space lands

CountryNamePrefixes
USUnited States of America813

Review

Flagged prefixes

20 of 813
PrefixFamilyAddressesCountryFlags
137.164.23.52/30IPv44USToo specific
137.164.23.56/30IPv44USToo specific
137.164.23.176/31IPv42USToo specific
2607:f380:1::118:9a41:7380/122IPv6/122USToo specific
2607:f720:1700::/52IPv6/52USToo specific
2607:f720:1700:1000::/53IPv6/53USToo specific
2607:f720:1700:1800::/55IPv6/55USToo specific
2607:f720:1700:1a00::/56IPv6/56USToo specific
2607:f720:1700:1b00::/59IPv6/59USToo specific
2607:f720:1700:1b20::/60IPv6/60USToo specific
2607:f720:1700:1b31::/64IPv6/64USToo specific
2607:f720:1700:1b32::/63IPv6/63USToo specific
2607:f720:1700:1b34::/62IPv6/62USToo specific
2607:f720:1700:1b38::/61IPv6/61USToo specific
2607:f720:1700:1b40::/58IPv6/58USToo specific
2607:f720:1700:1b80::/57IPv6/57USToo specific
2607:f720:1700:1c00::/54IPv6/54USToo specific
2607:f720:1700:2000::/51IPv6/51USToo specific
2607:f720:1700:4000::/50IPv6/50USToo specific
2607:f720:1700:8000::/49IPv6/49USToo specific

A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.