[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ESnet (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Fri May 2 22:20:39 UTC 2025
IPv4 R&E Routing Table Report 22:20 GMT Fri 02 May, 2025
IPv4 BGP Table (R&E) as seen at ESnet.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/ESnet/
Analysis Summary
----------------
BGP routing table entries examined: 18943
Prefixes after maximum aggregation (per Origin AS): 10327
Deaggregation factor: 1.83
Unique aggregates announced (without unneeded subnets): 11407
Number of IPv4 prefixes with a valid ROA: 7590
Number of IPv4 prefixes with an invalid ROA: 2
Number of IPv4 prefixes with no ROA: 11351
Total ASes present in the Internet Routing Table: 2749
Prefixes per ASN: 6.89
Origin-only ASes present in the Internet Routing Table: 2392
Origin ASes announcing only one prefix: 1060
Transit ASes present in the Internet Routing Table: 357
Transit-only ASes present in the Internet Routing Table: 57
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 3.8
Max AS path length visible: 20
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 35
Number of instances of unregistered ASNs: 35
Number of 32-bit ASNs allocated by the RIRs: 46309
Number of 32-bit ASNs visible in the Routing Table: 696
Prefixes from 32-bit ASNs in the Routing Table: 1912
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 168086528
Equivalent to 10 /8s, 4 /16s and 204 /24s
Percentage of available address space announced: 4.5
Percentage of allocated address space announced: 4.5
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 2313
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4766
Total APNIC prefixes after maximum aggregation: 2273
APNIC Deaggregation factor: 2.10
Prefixes being announced from the APNIC address blocks: 4767
Unique aggregates announced from the APNIC address blocks: 2646
APNIC Region origin ASes present in the Internet Routing Table: 579
APNIC Prefixes per ASN: 8.23
APNIC Region origin ASes announcing only one prefix: 236
APNIC Region transit ASes present in the Internet Routing Table: 52
Average APNIC Region AS path length visible: 3.8
Max APNIC Region AS path length visible: 12
Number of APNIC region 32-bit ASNs visible in the Routing Table: 231
Number of APNIC addresses announced to Internet: 35768320
Equivalent to 2 /8s, 33 /16s and 200 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 8360
Total ARIN prefixes after maximum aggregation: 4651
ARIN Deaggregation factor: 1.80
Prefixes being announced from the ARIN address blocks: 8403
Unique aggregates announced from the ARIN address blocks: 5135
ARIN Region origin ASes present in the Internet Routing Table: 1284
ARIN Prefixes per ASN: 6.54
ARIN Region origin ASes announcing only one prefix: 456
ARIN Region transit ASes present in the Internet Routing Table: 155
Average ARIN Region AS path length visible: 3.8
Max ARIN Region AS path length visible: 15
Number of ARIN region 32-bit ASNs visible in the Routing Table: 230
Number of ARIN addresses announced to Internet: 72833280
Equivalent to 4 /8s, 87 /16s and 89 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3535
Total RIPE prefixes after maximum aggregation: 2822
RIPE Deaggregation factor: 1.25
Prefixes being announced from the RIPE address blocks: 3526
Unique aggregates announced from the RIPE address blocks: 2908
RIPE Region origin ASes present in the Internet Routing Table: 653
RIPE Prefixes per ASN: 5.40
RIPE Region origin ASes announcing only one prefix: 290
RIPE Region transit ASes present in the Internet Routing Table: 102
Average RIPE Region AS path length visible: 3.7
Max RIPE Region AS path length visible: 13
Number of RIPE region 32-bit ASNs visible in the Routing Table: 149
Number of RIPE addresses announced to Internet: 53229568
Equivalent to 3 /8s, 44 /16s and 56 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1101
Total LACNIC prefixes after maximum aggregation: 402
LACNIC Deaggregation factor: 2.74
Prefixes being announced from the LACNIC address blocks: 1100
Unique aggregates announced from the LACNIC address blocks: 493
LACNIC Region origin ASes present in the Internet Routing Table: 121
LACNIC Prefixes per ASN: 9.09
LACNIC Region origin ASes announcing only one prefix: 49
LACNIC Region transit ASes present in the Internet Routing Table: 20
Average LACNIC Region AS path length visible: 4.0
Max LACNIC Region AS path length visible: 10
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 57
Number of LACNIC addresses announced to Internet: 3767296
Equivalent to 0 /8s, 57 /16s and 124 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1146
Total AfriNIC prefixes after maximum aggregation: 172
AfriNIC Deaggregation factor: 6.66
Prefixes being announced from the AfriNIC address blocks: 1145
Unique aggregates announced from the AfriNIC address blocks: 223
AfriNIC Region origin ASes present in the Internet Routing Table: 51
AfriNIC Prefixes per ASN: 22.45
AfriNIC Region origin ASes announcing only one prefix: 29
AfriNIC Region transit ASes present in the Internet Routing Table: 9
Average AfriNIC Region AS path length visible: 4.5
Max AfriNIC Region AS path length visible: 20
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 29
Number of AfriNIC addresses announced to Internet: 2485760
Equivalent to 0 /8s, 37 /16s and 238 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 622 2170 462 SINET-AS Research Organization of Informa
7497 454 180 24 CSTNET-AS-AP Computer Network Information
1237 193 74 145 KREONET-AS-KR KISTI, KR
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
4538 173 2402 81 ERX-CERNET-BKB China Education and Resear
7575 168 281 112 AARNET-AS-AP Australian Academic and Rese
55824 146 19 21 NKN-CORE-NW NKN Core Network, IN
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 59 35 8 UNINET-AS-AP UNINET-, TH
23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2152 543 507 99 CENIC-2152, US
2920 222 44 49 LACOE, US
376 202 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
18558 140 18 5 NETBLK-RCOEK, US
81 128 471 35 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
237 85 542 51 MERIT-AS-14, US
1736 79 16 1 MU-AS, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 283 1899 249 DFN Verein zur Foerderung eines Deutschen
786 194 1750 186 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 109 24 5 ISU Internet Services Unit ISU, SA
1103 95 1231 82 SURFNET-NL SURFnet, The Netherlands, NL
2614 89 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
3267 77 26 67 NIKS, RU
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 241 178 41 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
2715 44 99 33 Fundacao Carlos Chagas Filho de Amparo a
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
3596 37 8 4 Universidad Autonoma Metropolitana, MX
20191 28 16 1 Pontificia Universidad Catolica de Chile,
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 550 82 3 KENET-AS, KE
2018 373 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 34 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
37661 9 6 3 NRaE1-AS, NG
36982 8 33 8 UCT, ZA
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 622 2170 462 SINET-AS Research Organization of Informa
36914 550 82 3 KENET-AS, KE
2152 543 507 99 CENIC-2152, US
7497 454 180 24 CSTNET-AS-AP Computer Network Information
2018 373 318 69 TENET-1, ZA
680 283 1899 249 DFN Verein zur Foerderung eines Deutschen
1916 241 178 41 Rede Nacional de Ensino e Pesquisa, BR
2920 222 44 49 LACOE, US
376 202 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
36914 550 547 KENET-AS, KE
2152 543 444 CENIC-2152, US
7497 454 430 CSTNET-AS-AP Computer Network Information Cente
2018 373 304 TENET-1, ZA
1916 241 200 Rede Nacional de Ensino e Pesquisa, BR
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 222 173 LACOE, US
18558 140 135 NETBLK-RCOEK, US
55824 146 125 NKN-CORE-NW NKN Core Network, IN
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
36288 UNALLOCATED 64.79.154.0/24 293 ESNET, US
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
164.160.192.0/21 Origin: 37661 NRaE1-AS, NG
164.160.192.0/21 Transit: 37288 WACREN, SN
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:0 /10:0 /11:0 /12:0
/13:0 /14:33 /15:114 /16:1929 /17:419 /18:457
/19:588 /20:852 /21:837 /22:1450 /23:1597 /24:10667
/25:0 /26:0 /27:0 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 526 550 KENET-AS, KE
8895 106 109 ISU Internet Services Unit ISU, SA
2152 63 543 CENIC-2152, US
23024 38 99 OCDE, US
3267 35 77 NIKS, RU
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
32440 31 56 LONI, US
200521 31 55 SEAP-AGE, ES
25977 30 44 HCCS, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:15 8:5 12:2 14:93 18:39
23:12 24:3 31:1 35:10 37:9 38:13
40:1 41:221 42:18 44:4 45:44 46:4
47:1 49:8 50:4 52:1 58:15 59:20
60:6 61:3 62:6 63:36 64:47 65:20
66:52 67:43 68:18 69:17 70:2 71:1
72:8 74:53 76:36 77:9 78:3 79:9
80:13 81:24 82:6 83:8 84:5 85:51
86:2 87:1 89:10 91:40 92:2 93:14
94:2 95:2 96:5 97:1 98:2 101:3
102:10 103:348 104:77 107:2 108:8 109:5
111:21 113:1 114:24 116:7 117:61 118:33
119:31 121:28 122:8 123:8 124:42 125:5
128:58 129:43 130:98 131:63 132:67 133:156
134:105 136:200 137:100 138:10 139:12 140:32
141:3 142:26 143:25 144:31 145:2 146:138
147:52 148:42 149:11 150:69 151:13 152:126
153:15 154:45 155:80 156:129 157:24 158:28
159:117 160:32 161:15 162:30 163:58 164:11
165:43 166:2 167:29 168:103 169:7 170:26
171:1 172:2 173:6 174:1 175:16 177:5
179:13 180:16 181:1 182:12 184:1 185:49
186:3 187:24 188:14 189:3 190:17 191:13
192:1377 193:287 194:119 195:71 196:147 197:335
198:517 199:245 200:295 201:36 202:631 203:431
204:402 205:175 206:213 207:312 208:67 209:170
210:224 211:4 212:145 213:4 216:92 217:18
218:22 219:6 220:16 222:4 223:5
End of report
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